Fix message text for modal prompts when PermissionRequestManager enabled

chrome/browser/media/webrtc/media_stream_devices_controller.h

 // Copyright (c) 2012 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 CHROME_BROWSER_MEDIA_WEBRTC_MEDIA_STREAM_DEVICES_CONTROLLER_H_
 #define CHROME_BROWSER_MEDIA_WEBRTC_MEDIA_STREAM_DEVICES_CONTROLLER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 34 matching lines @@
     Request(Profile* profile,
             bool is_asking_for_audio,
             bool is_asking_for_video,
             const GURL& security_origin,
             PromptAnsweredCallback prompt_answered_callback);
 
     ~Request() override;
 
     bool IsAskingForAudio() const;
     bool IsAskingForVideo() const;
-    base::string16 GetMessageText() const;
 
     // PermissionRequest:
     IconId GetIconId() const override;
+#if defined(OS_ANDROID)
+    base::string16 GetMessageText() const override;
+#endif
     base::string16 GetMessageTextFragment() const override;
     GURL GetOrigin() const override;
     void PermissionGranted() override;
     void PermissionDenied() override;
     void Cancelled() override;
     void RequestFinished() override;
     PermissionRequestType GetPermissionRequestType() const override;
     bool ShouldShowPersistenceToggle() const override;
 
    private:
@@ skipping 120 matching lines @@
   // The callback that needs to be Run to notify WebRTC of whether access to
   // audio/video devices was granted or not.
   content::MediaResponseCallback callback_;
 
   std::unique_ptr<PermissionPromptDelegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamDevicesController);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_WEBRTC_MEDIA_STREAM_DEVICES_CONTROLLER_H_