Bug 1270056 - skip the GC in nsGlobalWindow::SetNewDocument() r=smaug

dom/base/nsGlobalWindow.cpp

@@ -3175,7 +3175,6 @@ nsGlobalWindow::SetNewDocument(nsIDocument* aDocument,
                                      newInnerWindow->GetDocGroup()->GetValidAccessPtr());
   }
 
-  nsJSContext::PokeGC(JS::gcreason::SET_NEW_DOCUMENT, GetWrapperPreserveColor());
   kungFuDeathGrip->DidInitializeContext();
 
   // We wait to fire the debugger hook until the window is all set up and hooked

dom/base/nsJSEnvironment.cpp

@@ -1183,8 +1183,9 @@ nsJSContext::GarbageCollectNow(JS::gcreason::Reason aReason,
                                IsShrinking aShrinking,
                                int64_t aSliceMillis)
 {
-  PROFILER_LABEL("nsJSContext", "GarbageCollectNow",
-    js::ProfileEntry::Category::GC);
+  PROFILER_LABEL_PRINTF("nsJSContext", "GarbageCollectNow",
+                        js::ProfileEntry::Category::GC,
+                        "%s", JS::gcreason::ExplainReason(aReason));
 
   MOZ_ASSERT_IF(aSliceMillis, aIncremental == IncrementalGC);