Cleanup namespace usage in Source/core/{dom/* & fileapi/*}

Source/core/dom/Microtask.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 22 matching lines @@
 
 #include "public/platform/WebThread.h"
 #include "wtf/Functional.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class Microtask {
 public:
     static void performCheckpoint();
-    static void enqueueMicrotask(PassOwnPtr<blink::WebThread::Task>);
+    static void enqueueMicrotask(PassOwnPtr<WebThread::Task>);
     static void enqueueMicrotask(const Closure&);
 
 private:
     explicit Microtask();
 };
 
-}
+} // namespace blink
 
 #endif // Microtask_h