Cleanup namespace usage in Source/web/[A-V]*.h

Source/web/AssociatedURLLoader.h

Index: Source/web/AssociatedURLLoader.h
diff --git a/Source/web/AssociatedURLLoader.h b/Source/web/AssociatedURLLoader.h
index d7b0683d2f4c3b26725ac8f7c32a9ed0677f3807..1d111a94ec613d3788f70900bf897eea2b662693 100644
--- a/Source/web/AssociatedURLLoader.h
+++ b/Source/web/AssociatedURLLoader.h
@@ -37,10 +37,9 @@
 #include "wtf/OwnPtr.h"
 #include "wtf/RefPtr.h"
 
-namespace blink { class DocumentThreadableLoader; }
-
 namespace blink {
 
+class DocumentThreadableLoader;
 class WebLocalFrameImpl;
 
 // This class is used to implement WebFrame::createAssociatedURLLoader.
@@ -64,7 +63,7 @@ private:
     WebURLLoaderOptions m_options;
     WebURLLoaderClient* m_client;
     OwnPtr<ClientAdapter> m_clientAdapter;
-    RefPtr<blink::DocumentThreadableLoader> m_loader;
+    RefPtr<DocumentThreadableLoader> m_loader;
 };
 
 } // namespace blink