Bug 774388 - Bustage fix: don't try to shut down layers IPC if we didn't initialize it because we were running xpcshell only - no review

gfx/thebes/gfxPlatform.cpp

@@ -510,6 +510,9 @@ gfxPlatform::Shutdown()
 /* static */ void
 gfxPlatform::ShutdownLayersIPC()
 {
+    if (!gPlatform) {
+      return;
+    }
     MOZ_ASSERT(!gPlatform->mAlreadyShutDownLayersIPC);
     if (UsesOffMainThreadCompositing() &&
         XRE_GetProcessType() == GeckoProcessType_Default)