import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1172870 - Implement service workers clients.openWindow for desktop (non-e10s). r=baku,smaug (b236bb7abe)
- Bug 1188545 - Prevent service workers from being terminated while checking if the script evaluation was successful. r=nsm (c92e4159f4)
- Bug 1214300 - AsyncErrorReporter doesn't use JSRuntime param., r=smaug (91534bd3e3)
- Bug 1202001 - Log errors emitted during service worker lifecycle events to the Web Console; r=bkelly (a28967cbc7)
- Bug 1189673 - Set FetchEvent.request.headers' guard to immutable before dispatching the FetchEvent; r=bkelly (9e49512912)
- Bug 1215140 P7 Remove old service worker interception logging. r=bz (ecbf828102)
- Bug 1215140 P8 Remove now unnecessary interception values from ErrorList.h. r=bz (1fa026bef7)
- Bug 1215140 P9 Provide file and line number when FetchEvent.preventDefault() cancels a request. r=bz (fb9bc6ba03)
- Bug 1215140 P10 Avoid AddRef'ing the nsIChannel OMT. r=bz (cf82339f63)
- Bug 1216401: Eviscerate nsIDOMWindow, move still needed methods to nsPIDOMWindow. r=bz (9bd51a95eb)
- Bug 1172870 - Part 1 - Move PBrowser::CreateWindow to PContent. r=smaug (f91e410853)
- Bug 1172870 - Part 2 - Enable ServiceWorkerClients::OpenWindow on e10s desktop. r=smaug (aefff3b138)
- Bug 1222097 - Resolve the openWindow URL using the service worker URL as the base URL. r=bkelly (6ebd7fe6c9)
- Bug 1172870 - Part 3 - Fix openWindow mochitest to work on e10s. r=smaug (9652eead7a)
- Bug 1191724, ensure private browser flag is set on docshell early enough, r=fabrice (38f909e960)
- Bug 1189964 - Fix a crash handling drags on dying windows. r=smaug (3b7bf446d7)
- misspatch of 1162700 (ceb869512f)

dom/base/nsDOMWindowUtils.cpp

@@ -2097,15 +2097,20 @@ nsDOMWindowUtils::GetVisitedDependentComputedStyle(
   MOZ_RELEASE_ASSERT(nsContentUtils::IsCallerChrome());
 
   nsCOMPtr<nsPIDOMWindow> window = do_QueryReferent(mWindow);
+  nsCOMPtr<Element> element = do_QueryInterface(aElement);
+  NS_ENSURE_STATE(window && element);
+  window = window->GetCurrentInnerWindow();
   NS_ENSURE_STATE(window);
 
   nsCOMPtr<nsIDOMCSSStyleDeclaration> decl;
-  nsresult rv =
-    window->GetComputedStyle(aElement, aPseudoElement, getter_AddRefs(decl));
-  NS_ENSURE_SUCCESS(rv, rv);
+  {
+    ErrorResult rv;
+    decl = window->GetComputedStyle(*element, aPseudoElement, rv);
+    ENSURE_SUCCESS(rv, rv.StealNSResult());
+  }
 
   static_cast<nsComputedDOMStyle*>(decl.get())->SetExposeVisitedStyle(true);
-  rv = decl->GetPropertyValue(aPropertyName, aResult);
+  nsresult rv = decl->GetPropertyValue(aPropertyName, aResult);
   static_cast<nsComputedDOMStyle*>(decl.get())->SetExposeVisitedStyle(false);
 
   return rv;