Cleanup namespace usage in public/web/Web[A-M]*.h.

public/web/WebDOMMediaStreamTrack.h

Index: public/web/WebDOMMediaStreamTrack.h
diff --git a/public/web/WebDOMMediaStreamTrack.h b/public/web/WebDOMMediaStreamTrack.h
index 3d35f63e867556be786d5e95339b42c981419b8a..b66f7fc259e721606642ac9e97fe88b6fa800f4f 100644
--- a/public/web/WebDOMMediaStreamTrack.h
+++ b/public/web/WebDOMMediaStreamTrack.h
@@ -43,10 +43,10 @@ class Value;
 template <class T> class Handle;
 }
 
-namespace blink { class MediaStreamTrack; }
-
 namespace blink {
 
+class MediaStreamTrack;
+
 class WebDOMMediaStreamTrack {
 public:
     WebDOMMediaStreamTrack(const WebDOMMediaStreamTrack& b) { assign(b); }
@@ -68,10 +68,10 @@ public:
 
 private:
 #if BLINK_IMPLEMENTATION
-    WebDOMMediaStreamTrack(PassRefPtrWillBeRawPtr<blink::MediaStreamTrack>);
+    WebDOMMediaStreamTrack(PassRefPtrWillBeRawPtr<MediaStreamTrack>);
 #endif
 
-    WebPrivatePtr<blink::MediaStreamTrack> m_private;
+    WebPrivatePtr<MediaStreamTrack> m_private;
 };
 
 } // namespace blink