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/nsDocument.cpp

@@ -3184,12 +3184,11 @@ nsIDocument::HasFocus(ErrorResult& rv) const
     return false;
   }
 
-  // Are we an ancestor of the focused DOMWindow?
-  nsCOMPtr<nsIDOMDocument> domDocument;
-  focusedWindow->GetDocument(getter_AddRefs(domDocument));
-  nsCOMPtr<nsIDocument> document = do_QueryInterface(domDocument);
+  nsCOMPtr<nsPIDOMWindow> piWindow = do_QueryInterface(focusedWindow);
+  MOZ_ASSERT(piWindow);
 
-  for (nsIDocument* currentDoc = document; currentDoc;
+  // Are we an ancestor of the focused DOMWindow?
+  for (nsIDocument* currentDoc = piWindow->GetDoc(); currentDoc;
        currentDoc = currentDoc->GetParentDocument()) {
     if (currentDoc == this) {
       // Yes, we are an ancestor
@@ -6950,9 +6949,11 @@ nsIDocument::GetLocation() const
     return nullptr;
   }
 
-  nsCOMPtr<nsIDOMLocation> loc;
-  w->GetLocation(getter_AddRefs(loc));
-  return loc.forget().downcast<nsLocation>();
+  nsGlobalWindow* window = static_cast<nsGlobalWindow*>(w.get());
+  ErrorResult dummy;
+  RefPtr<nsLocation> loc = window->GetLocation(dummy);
+  dummy.SuppressException();
+  return loc.forget();
 }
 
 Element*