[Media Router] Remove unnecessary CONTENT_EXPORT.

content/public/browser/presentation_session.h

 // Copyright 2015 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 CONTENT_PUBLIC_BROWSER_PRESENTATION_SESSION_H_
 #define CONTENT_PUBLIC_BROWSER_PRESENTATION_SESSION_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
 
 namespace content {
 
-enum CONTENT_EXPORT PresentationSessionState {
+enum PresentationSessionState {
   PRESENTATION_SESSION_STATE_CONNECTED,
   PRESENTATION_SESSION_STATE_DISCONNECTED
 };
 
 // Represents a presentation session that has been established via either
 // browser actions or Presentation API.
 struct CONTENT_EXPORT PresentationSessionInfo {
   PresentationSessionInfo(const std::string& presentation_url,
                           const std::string& presentation_id);
   ~PresentationSessionInfo();
@@ skipping 16 matching lines @@
                     const std::string& message);
   ~PresentationError();
 
   const PresentationErrorType error_type;
   const std::string message;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PRESENTATION_SESSION_H_