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

public/platform/WebContentDecryptionModuleResult.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebContentDecryptionModuleResult_h
 #define WebContentDecryptionModuleResult_h
 
 #include "WebCommon.h"
 #include "WebContentDecryptionModuleException.h"
 #include "WebPrivatePtr.h"
 
 namespace blink {
+
 class ContentDecryptionModuleResult;
-}
-
-namespace blink {
-
 class WebString;
 
 class WebContentDecryptionModuleResult {
 public:
     enum SessionStatus {
         // New session has been initialized.
         NewSession,
 
         // CDM could not find the requested session.
         SessionNotFound,
@@ skipping 23 matching lines @@
     // pass back.
     BLINK_PLATFORM_EXPORT void complete();
 
     // Called when the CDM completes a session operation.
     BLINK_PLATFORM_EXPORT void completeWithSession(SessionStatus);
 
     // Called when the operation fails.
     BLINK_PLATFORM_EXPORT void completeWithError(WebContentDecryptionModuleException, unsigned long systemCode, const WebString& message);
 
 #if INSIDE_BLINK
-    BLINK_PLATFORM_EXPORT explicit WebContentDecryptionModuleResult(blink::ContentDecryptionModuleResult*);
+    BLINK_PLATFORM_EXPORT explicit WebContentDecryptionModuleResult(ContentDecryptionModuleResult*);
 #endif
 
 private:
     BLINK_PLATFORM_EXPORT void reset();
     BLINK_PLATFORM_EXPORT void assign(const WebContentDecryptionModuleResult&);
 
-    WebPrivatePtr<blink::ContentDecryptionModuleResult> m_impl;
+    WebPrivatePtr<ContentDecryptionModuleResult> m_impl;
 };
 
 } // namespace blink
 
 #endif // WebContentDecryptionModuleSession_h