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

public/web/WebMIDIClient.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebMIDIClient_h
 #define WebMIDIClient_h
 
 namespace blink {
+
 class WebMIDIPermissionRequest;
 
 class WebMIDIClient {
 public:
     virtual ~WebMIDIClient() { }
 
     // Request a permission to use system exclusive messages. Called when
     // MIDIOptions.sysex is true.
     // Once the request is done, any WebMIDIPermissionRequest instances equal to
     // |request| must not be accessed after that.
     virtual void requestSysexPermission(const WebMIDIPermissionRequest& /* request */) = 0;
 
     // Cancel the request since the requesting frame may be moving to
     // a new page.
     // Once canceled, any WebMIDIPermissionRequest instances equal to
     // |request| must not be accessed after that.
     virtual void cancelSysexPermissionRequest(const WebMIDIPermissionRequest& /* request */) = 0;
 };
 
 } // namespace blink
 
 #endif // WebMIDIClient_h