Bug 1377355 - Unable to load unpacked web extensions in about:debugging; content script cannot be loaded; r=jimm

Remove the system principal check for unpacked (development) moz-extension loads
and rely on the existing host, scheme, and filesystem checks.

MozReview-Commit-ID: 7aI6dJsRJtP

--HG--
extra : rebase_source : 545de6efa0efb3935a22dd6e5375f0b6fe0d3d57

netwerk/protocol/res/ExtensionProtocolHandler.cpp

@@ -19,7 +19,6 @@
 #include "FileDescriptor.h"
 #include "FileDescriptorFile.h"
 #include "LoadInfo.h"
-#include "nsContentUtils.h"
 #include "nsServiceManagerUtils.h"
 #include "nsIFile.h"
 #include "nsIFileChannel.h"
@@ -558,12 +557,6 @@ ExtensionProtocolHandler::NewStream(nsIURI* aChildURI,
    * channel is a file channel.
    */
 
-  nsCOMPtr<nsIPrincipal> childPrincipal;
-  NS_TRY(aChildLoadInfo->GetLoadingPrincipal(getter_AddRefs(childPrincipal)));
-  if (nsContentUtils::IsSystemPrincipal(childPrincipal)) {
-    return Err(NS_ERROR_FILE_ACCESS_DENIED);
-  }
-
   nsCOMPtr<nsIChannel> channel;
   NS_TRY(NS_NewChannelInternal(getter_AddRefs(channel),
                                aChildURI,