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

Source/core/dom/MessageChannel.cpp

Index: Source/core/dom/MessageChannel.cpp
diff --git a/Source/core/dom/MessageChannel.cpp b/Source/core/dom/MessageChannel.cpp
index 4e74498074390235a2dd8e4b4ef40d21cc4ba32b..eb82673d3a0ae517e895122fb49b4a0ae02120d4 100644
--- a/Source/core/dom/MessageChannel.cpp
+++ b/Source/core/dom/MessageChannel.cpp
@@ -37,9 +37,9 @@ 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.