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

- Bug 524674, nsIEventListenerService: tracking of dynamically added and removed event listeners, r=masayuki (a1779bcaf)
- Bug 418986 - Resist fingerprinting by preventing exposure of screen and system info. r=mrbkap, r=heycam (97710708a)
- bug 1171785 create nsContentUtils::RunInStableState helper r=bholley (c71678a0e)
- bug 1172377 change RunInStableState API to receive ownership of nsIRunnable r=roc (3d5c72cac)
- bug 1171785 use nsContentUtils::RunInStableState() r=bholley (1c0acca87)
- Bug 1172784 (part 1) - Remove unused argument from UnmarkGrayJSListenersInCCGenerationDocuments(). r=mccr8. (a3a26ec9f)
- Bug 1172784 (part 2) - Remove PL_DHashTableEnumerate use from nsContentUtils. r=mccr8. (792b83f8e)
- Bug 1171832 - Remove PL_DHashTableEnumerator use from nsDocument. r=smaug. (eb265bb3a)
- Bug 819090 - Convert nsRefMapEntry::mRefContentList to nsTArray. r=froydnj (509060d38)
- Bug 819090 - Convert BroadcasterMapEntry::mListeners to nsTArray. r=froydnj (6b1bd7232)
- Bug 819090 - Convert nsDocument::mIdContentList to nsTArray. r=froydnj (41ebb3a64)
- Bug 819090 - Remove nsVoidArray.{cpp,h}. r=froydnj (6038b4fc7)
- Bug 1199143 - Inline heavyweight functions. r=shu (798a24e44)
- bug 1150136 - rel=preconnect from html parser r=hsivonen (1a078efcb)
- Bug 1135812 - Make picture element react to viewport changes. r=dbaron,johns (4b405d69c)
- add missing testcase (cb6c04747)

widget/nsScreenManagerProxy.cpp

@@ -200,9 +200,9 @@ nsScreenManagerProxy::InvalidateCacheOnNextTick()
 
   nsCOMPtr<nsIAppShell> appShell = do_GetService(kAppShellCID);
   if (appShell) {
-    appShell->RunInStableState(
-      NS_NewRunnableMethod(this, &nsScreenManagerProxy::InvalidateCache)
-    );
+    nsCOMPtr<nsIRunnable> r =
+      NS_NewRunnableMethod(this, &nsScreenManagerProxy::InvalidateCache);
+    appShell->RunInStableState(r.forget());
   } else {
     // It's pretty bad news if we can't get the appshell. In that case,
     // let's just invalidate the cache right away.