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

Source/core/dom/MessageChannel.cpp

 /*
  * Copyright (C) 2008 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 19 matching lines @@
 #include "core/dom/MessagePort.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebMessagePortChannel.h"
 
 namespace blink {
 
 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MessageChannel);
 
 static void createChannel(MessagePort* port1, MessagePort* port2)
 {
-    blink::WebMessagePortChannel* channel1;
-    blink::WebMessagePortChannel* channel2;
-    blink::Platform::current()->createMessageChannel(&channel1, &channel2);
+    WebMessagePortChannel* channel1;
+    WebMessagePortChannel* channel2;
+    Platform::current()->createMessageChannel(&channel1, &channel2);
     ASSERT(channel1 && channel2);
 
     // Now entangle the proxies with the appropriate local ports.
     port1->entangle(adoptPtr(channel2));
     port2->entangle(adoptPtr(channel1));
 }
 
 MessageChannel::MessageChannel(ExecutionContext* context)
     : m_port1(MessagePort::create(*context))
     , m_port2(MessagePort::create(*context))
 {
     ScriptWrappable::init(this);
     createChannel(m_port1.get(), m_port2.get());
 }
 
 void MessageChannel::trace(Visitor* visitor)
 {
     visitor->trace(m_port1);
     visitor->trace(m_port2);
 }
 
 } // namespace blink