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

public/platform/WebWorkerRunLoop.h

Index: public/platform/WebWorkerRunLoop.h
diff --git a/public/platform/WebWorkerRunLoop.h b/public/platform/WebWorkerRunLoop.h
index c6adda310a3f0edad26b7965c26f023815940f56..748d111a25722d813c934b89fd778df990c4b2e0 100644
--- a/public/platform/WebWorkerRunLoop.h
+++ b/public/platform/WebWorkerRunLoop.h
@@ -28,10 +28,8 @@
 #include "WebCommon.h"
 
 namespace blink {
-class WorkerThread;
-}
 
-namespace blink {
+class WorkerThread;
 
 class WebWorkerRunLoop {
 public:
@@ -47,11 +45,11 @@ public:
     BLINK_EXPORT bool lessThan(const WebWorkerRunLoop&) const;
 
 #if BLINK_IMPLEMENTATION
-    WebWorkerRunLoop(blink::WorkerThread*);
+    WebWorkerRunLoop(WorkerThread*);
 #endif
 
 private:
-    blink::WorkerThread* m_workerThread;
+    WorkerThread* m_workerThread;
 };
 
 inline bool operator==(const WebWorkerRunLoop& a, const WebWorkerRunLoop& b)