Bug 1373525 - ipc: Remove unused classes EmptyStrings and InitUDPSocketParentCallback. r=dvander

ipc/chromium/src/base/string_util.cc:35:3 [-Wunused-member-function] unused member function 'EmptyStrings'
ipc/glue/BackgroundParentImpl.cpp:405:3: warning: unused member function 'InitUDPSocketParentCallback' [-Wunused-member-function]

The class InitUDPSocketParentCallback was added in bug 1109338. It wasn't used then and it isn't used now.

https://hg.mozilla.org/mozilla-central/rev/eefcbe8e6a0c

MozReview-Commit-ID: BfDbQ5dfgo8

--HG--
extra : source : 7411baa0c64638b9da7de813c578fe9505625690
extra : intermediate-source : 975014d05919be2c9c6a0672c1ae94da86ccb29b

ipc/chromium/src/base/string_util.cc

@@ -28,16 +28,6 @@
 
 namespace {
 
-// Force the singleton used by Empty[W]String[16] to be a unique type. This
-// prevents other code that might accidentally use Singleton<string> from
-// getting our internal one.
-struct EmptyStrings {
-  EmptyStrings() {}
-  const std::string s;
-  const std::wstring ws;
-  const string16 s16;
-};
-
 // Hack to convert any char-like type to its unsigned counterpart.
 // For example, it will convert char, signed char and unsigned char to unsigned
 // char.

ipc/glue/BackgroundParentImpl.cpp

@@ -397,41 +397,6 @@ BackgroundParentImpl::DeallocPCamerasParent(camera::PCamerasParent *aActor)
   return true;
 }
 
-namespace {
-
-class InitUDPSocketParentCallback final : public Runnable
-{
-public:
-  InitUDPSocketParentCallback(UDPSocketParent* aActor,
-                              const nsACString& aFilter)
-    : mActor(aActor)
-    , mFilter(aFilter)
-  {
-    AssertIsInMainProcess();
-    AssertIsOnBackgroundThread();
-  }
-
-  NS_IMETHOD
-  Run() override
-  {
-    AssertIsInMainProcess();
-
-    IPC::Principal principal;
-    if (!mActor->Init(principal, mFilter)) {
-      MOZ_CRASH("UDPSocketCallback - failed init");
-    }
-    return NS_OK;
-  }
-
-private:
-  ~InitUDPSocketParentCallback() override = default;
-
-  RefPtr<UDPSocketParent> mActor;
-  nsCString mFilter;
-};
-
-} // namespace
-
 auto
 BackgroundParentImpl::AllocPUDPSocketParent(const OptionalPrincipalInfo& /* unused */,
                                             const nsCString& /* unused */)