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

public/platform/WebRTCVoidRequest.h

Index: public/platform/WebRTCVoidRequest.h
diff --git a/public/platform/WebRTCVoidRequest.h b/public/platform/WebRTCVoidRequest.h
index f037eaa4d35e1ef75875dbdba8bd6c0fa9fa9e10..fc9e2e4bce2763952d6762d0c48099a4266bd110 100644
--- a/public/platform/WebRTCVoidRequest.h
+++ b/public/platform/WebRTCVoidRequest.h
@@ -37,10 +37,8 @@
 #include "WebString.h"
 
 namespace blink {
-class RTCVoidRequest;
-}
 
-namespace blink {
+class RTCVoidRequest;
 
 class WebRTCVoidRequest {
 public:
@@ -75,11 +73,11 @@ public:
     BLINK_PLATFORM_EXPORT void setExtraData(ExtraData*);
 
 #if INSIDE_BLINK
-    BLINK_PLATFORM_EXPORT WebRTCVoidRequest(const WTF::PassRefPtr<blink::RTCVoidRequest>&);
+    BLINK_PLATFORM_EXPORT WebRTCVoidRequest(const WTF::PassRefPtr<RTCVoidRequest>&);
 #endif
 
 private:
-    WebPrivatePtr<blink::RTCVoidRequest> m_private;
+    WebPrivatePtr<RTCVoidRequest> m_private;
 };
 
 } // namespace blink