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

Source/core/dom/Microtask.cpp

Index: Source/core/dom/Microtask.cpp
diff --git a/Source/core/dom/Microtask.cpp b/Source/core/dom/Microtask.cpp
index 70dfcf8c9cefecef86056ecdd1d2c87d991103e0..d2ffaed202eda2bbf59fc1a323e1a94e218ea008 100644
--- a/Source/core/dom/Microtask.cpp
+++ b/Source/core/dom/Microtask.cpp
@@ -52,11 +52,11 @@ void Microtask::performCheckpoint()
 
 static void microtaskFunctionCallback(void* data)
 {
-    OwnPtr<blink::WebThread::Task> task = adoptPtr(static_cast<blink::WebThread::Task*>(data));
+    OwnPtr<WebThread::Task> task = adoptPtr(static_cast<WebThread::Task*>(data));
     task->run();
 }
 
-void Microtask::enqueueMicrotask(PassOwnPtr<blink::WebThread::Task> callback)
+void Microtask::enqueueMicrotask(PassOwnPtr<WebThread::Task> callback)
 {
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     isolate->EnqueueMicrotask(&microtaskFunctionCallback, callback.leakPtr());