Bug 1730282 - Cleanup IPC WebGL code. r=gfx-reviewers,lsalzman

* Replace QueueStatus with bool
* Remove unused structs and code
* Add some MOZ_LIKELY to (de)serialization branches

Differential Revision: https://phabricator.services.mozilla.com/D125295

dom/canvas/ClientWebGLContext.cpp

@@ -27,6 +27,7 @@
 #include "mozilla/layers/WebRenderUserData.h"
 #include "mozilla/layers/WebRenderCanvasRenderer.h"
 #include "mozilla/Preferences.h"
+#include "mozilla/ResultVariant.h"
 #include "mozilla/ScopeExit.h"
 #include "mozilla/StaticPrefs_webgl.h"
 #include "nsContentUtils.h"