Bug 1575744 - P8. Remove no longer necessary interface. r=mayhemer

Thanks to the promisifying of SendCrossProcessRedirect we no longer needs callback to DocumentChannelParent from nsHttpChannelParent. So we can remove the interface that allowed to do so.

Differential Revision: https://phabricator.services.mozilla.com/D46174

--HG--
rename : netwerk/base/nsICrossProcessSwitchChannel.idl => netwerk/base/nsIProcessSwitchRequestor.idl
extra : moz-landing-system : lando

netwerk/base/moz.build

@@ -35,7 +35,6 @@ XPIDL_SOURCES += [
     'nsIClassifiedChannel.idl',
     'nsIClassOfService.idl',
     'nsIContentSniffer.idl',
-    'nsICrossProcessSwitchChannel.idl',
     'nsIDashboard.idl',
     'nsIDashboardEventNotifier.idl',
     'nsIDeprecationWarner.idl',
@@ -76,6 +75,7 @@ XPIDL_SOURCES += [
     'nsIPermission.idl',
     'nsIPermissionManager.idl',
     'nsIPrivateBrowsingChannel.idl',
+    'nsIProcessSwitchRequestor.idl',
     'nsIProgressEventSink.idl',
     'nsIPrompt.idl',
     'nsIProtocolHandler.idl',

netwerk/base/nsIProcessSwitchRequestor.idl

@@ -4,26 +4,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#include "nsISupports.idl"
-#include "nsIAsyncVerifyRedirectCallback.idl"
-#include "nsIHttpChannel.idl"
-
-[scriptable, uuid(d2471b64-0292-4cb5-b801-914e34b31af0)]
-interface nsICrossProcessSwitchChannel : nsISupports
-{
-  /**
-   *  When a process switch is about to start,
-   *  nsHttpChannel will call this method on DocumentChannelParent or
-   *  HttpChannelParent
-   *
-   *  @param channel
-   *         nsIHttpChannel caller.
-   *  @param identifier
-   *         identifier from SessionStore to be passed to the childChannel in
-   *         order to identify it.
-   */
-  void triggerCrossProcessSwitch(in nsIHttpChannel channel, in uint64_t identifier);
-};
+#include "nsIChannel.idl"
 
 /**
  * The nsIProcessSwitchRequestor interface allows clients to instruct

netwerk/ipc/DocumentChannelParent.cpp

@@ -39,7 +39,6 @@ NS_INTERFACE_MAP_BEGIN(DocumentChannelParent)
   NS_INTERFACE_MAP_ENTRY(nsIStreamListener)
   NS_INTERFACE_MAP_ENTRY(nsIParentChannel)
   NS_INTERFACE_MAP_ENTRY(nsIAsyncVerifyRedirectReadyCallback)
-  NS_INTERFACE_MAP_ENTRY(nsICrossProcessSwitchChannel)
   NS_INTERFACE_MAP_ENTRY(nsIChannelEventSink)
   NS_INTERFACE_MAP_ENTRY(nsIProcessSwitchRequestor)
   NS_INTERFACE_MAP_ENTRY_CONCRETE(DocumentChannelParent)
@@ -359,14 +358,6 @@ void DocumentChannelParent::FinishReplacementChannelSetup(bool aSucceeded) {
   }
 }
 
-nsresult DocumentChannelParent::TriggerCrossProcessSwitch(
-    nsIHttpChannel* aChannel, uint64_t aIdentifier) {
-  MOZ_ASSERT_UNREACHABLE(
-      "We can no longer be called from nsHttpChannel, this interface will be "
-      "removed in a follow-up patch");
-  return NS_OK;
-}
-
 void DocumentChannelParent::TriggerCrossProcessSwitch() {
   MOZ_ASSERT(mRedirectContentProcessIdPromise);
   CancelChildForProcessSwitch();

netwerk/ipc/DocumentChannelParent.h

@@ -13,11 +13,11 @@
 #include "mozilla/net/NeckoParent.h"
 #include "mozilla/net/PDocumentChannelParent.h"
 #include "mozilla/net/ParentChannelListener.h"
-#include "nsICrossProcessSwitchChannel.h"
 #include "nsIInterfaceRequestor.h"
 #include "nsIObserver.h"
 #include "nsIParentChannel.h"
 #include "nsIParentRedirectingChannel.h"
+#include "nsIProcessSwitchRequestor.h"
 #include "nsIRedirectResultListener.h"
 
 #define DOCUMENT_CHANNEL_PARENT_IID                  \
@@ -37,7 +37,6 @@ class DocumentChannelParent : public nsIInterfaceRequestor,
                               public nsIAsyncVerifyRedirectReadyCallback,
                               public nsIParentChannel,
                               public nsIChannelEventSink,
-                              public nsICrossProcessSwitchChannel,
                               public HttpChannelSecurityWarningReporter,
                               public nsIProcessSwitchRequestor {
  public:
@@ -54,7 +53,6 @@ class DocumentChannelParent : public nsIInterfaceRequestor,
   NS_DECL_NSIINTERFACEREQUESTOR
   NS_DECL_NSIASYNCVERIFYREDIRECTREADYCALLBACK
   NS_DECL_NSICHANNELEVENTSINK
-  NS_DECL_NSICROSSPROCESSSWITCHCHANNEL
   NS_DECL_NSIPROCESSSWITCHREQUESTOR
 
   NS_DECLARE_STATIC_IID_ACCESSOR(DOCUMENT_CHANNEL_PARENT_IID)

netwerk/protocol/http/HttpChannelParent.cpp

@@ -289,7 +289,6 @@ NS_INTERFACE_MAP_BEGIN(HttpChannelParent)
   NS_INTERFACE_MAP_ENTRY(nsIAsyncVerifyRedirectReadyCallback)
   NS_INTERFACE_MAP_ENTRY(nsIChannelEventSink)
   NS_INTERFACE_MAP_ENTRY(nsIRedirectResultListener)
-  NS_INTERFACE_MAP_ENTRY(nsICrossProcessSwitchChannel)
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIParentRedirectingChannel)
   NS_INTERFACE_MAP_ENTRY_CONCRETE(HttpChannelParent)
 NS_INTERFACE_MAP_END

netwerk/protocol/http/HttpChannelParent.h

@@ -14,7 +14,6 @@
 #include "mozilla/net/NeckoCommon.h"
 #include "mozilla/net/NeckoParent.h"
 #include "mozilla/MozPromise.h"
-#include "nsICrossProcessSwitchChannel.h"
 #include "nsIObserver.h"
 #include "nsIParentRedirectingChannel.h"
 #include "nsIProgressEventSink.h"
@@ -61,8 +60,7 @@ class HttpChannelParent final : public nsIInterfaceRequestor,
                                 public HttpChannelSecurityWarningReporter,
                                 public nsIAsyncVerifyRedirectReadyCallback,
                                 public nsIChannelEventSink,
-                                public nsIRedirectResultListener,
-                                public nsICrossProcessSwitchChannel {
+                                public nsIRedirectResultListener {
   virtual ~HttpChannelParent();
 
  public:
@@ -78,7 +76,6 @@ class HttpChannelParent final : public nsIInterfaceRequestor,
   NS_DECL_NSIASYNCVERIFYREDIRECTREADYCALLBACK
   NS_DECL_NSICHANNELEVENTSINK
   NS_DECL_NSIREDIRECTRESULTLISTENER
-  NS_DECL_NSICROSSPROCESSSWITCHCHANNEL
 
   NS_DECLARE_STATIC_IID_ACCESSOR(HTTP_CHANNEL_PARENT_IID)
 
@@ -132,6 +129,13 @@ class HttpChannelParent final : public nsIInterfaceRequestor,
 
   base::ProcessId OtherPid() const;
 
+  // Called by nsHttpChannel when a process switch is about to start.
+  // aChannel: nsIHttpChannel caller.
+  // aIdentifier: identifier from SessionStore to be passed to the childChannel
+  //              in order to identify it.
+  nsresult TriggerCrossProcessSwitch(nsIHttpChannel* aChannel,
+                                     uint64_t aIdentifier);
+
   // Calling this method will cancel the HttpChannelChild because the consumer
   // needs to be relocated to another process.
   // Any OnStart/Stop/DataAvailable calls that follow will not be sent to the

netwerk/protocol/http/nsHttpChannel.cpp

@@ -7298,8 +7298,7 @@ nsresult nsHttpChannel::StartCrossProcessRedirect() {
 
   nsCOMPtr<nsIParentChannel> parentChannel;
   NS_QueryNotificationCallbacks(this, parentChannel);
-  nsCOMPtr<nsICrossProcessSwitchChannel> httpParent =
-      do_QueryInterface(parentChannel);
+  RefPtr<HttpChannelParent> httpParent = do_QueryObject(parentChannel);
   MOZ_ASSERT(httpParent);
   NS_ENSURE_TRUE(httpParent, NS_ERROR_UNEXPECTED);
 

netwerk/protocol/http/nsHttpChannel.h

@@ -33,8 +33,8 @@
 #include "nsIRaceCacheWithNetwork.h"
 #include "mozilla/extensions/PStreamFilterParent.h"
 #include "mozilla/Mutex.h"
+#include "nsIProcessSwitchRequestor.h"
 #include "nsIRemoteTab.h"
-#include "nsICrossProcessSwitchChannel.h"
 
 class nsDNSPrefetch;
 class nsICancelable;

netwerk/protocol/http/nsHttpHandler.cpp

@@ -15,7 +15,6 @@
 #include "nsHttpChannel.h"
 #include "nsHttpAuthCache.h"
 #include "nsStandardURL.h"
-#include "nsICrossProcessSwitchChannel.h"
 #include "nsIDOMWindow.h"
 #include "nsIHttpChannel.h"
 #include "nsIStandardURL.h"
@@ -24,6 +23,7 @@
 #include "nsIPrefService.h"
 #include "nsIPrefBranch.h"
 #include "nsIPrefLocalizedString.h"
+#include "nsIProcessSwitchRequestor.h"
 #include "nsSocketProviderService.h"
 #include "nsISocketProvider.h"
 #include "nsPrintfCString.h"