Cleanup namespace usage in public/platform/{Web[P-W]*,linux/*}.h

public/platform/WebRTCStatsRequest.h

Index: public/platform/WebRTCStatsRequest.h
diff --git a/public/platform/WebRTCStatsRequest.h b/public/platform/WebRTCStatsRequest.h
index 57d76dc4ba830c4f108a344c119d1c97d4e61439..a3cf22eaa40a80cf42936e0b0eef98e8de51c9ec 100644
--- a/public/platform/WebRTCStatsRequest.h
+++ b/public/platform/WebRTCStatsRequest.h
@@ -36,11 +36,8 @@
 #include "WebString.h"
 
 namespace blink {
-class RTCStatsRequest;
-}
-
-namespace blink {
 
+class RTCStatsRequest;
 class WebMediaStreamTrack;
 class WebMediaStream;
 class WebRTCStatsResponse;
@@ -95,11 +92,11 @@ public:
     BLINK_PLATFORM_EXPORT WebRTCStatsResponse createResponse() const;
 
 #if INSIDE_BLINK
-    BLINK_PLATFORM_EXPORT WebRTCStatsRequest(const PassRefPtr<blink::RTCStatsRequest>&);
+    BLINK_PLATFORM_EXPORT WebRTCStatsRequest(const PassRefPtr<RTCStatsRequest>&);
 #endif
 
 private:
-    WebPrivatePtr<blink::RTCStatsRequest> m_private;
+    WebPrivatePtr<RTCStatsRequest> m_private;
 };
 
 } // namespace blink