Add warning icon to media throttle info bar to make it consistent with others

chrome/browser/android/media/media_throttle_infobar_delegate.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 CHROME_BROWSER_ANDROID_MEDIA_MEDIA_THROTTLE_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_ANDROID_MEDIA_MEDIA_THROTTLE_INFOBAR_DELEGATE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 13 matching lines @@
       content::WebContents* web_contents,
       const DecodeRequestGrantedCallback& callback);
 
  private:
   explicit MediaThrottleInfoBarDelegate(
       const DecodeRequestGrantedCallback& callback);
 
   // ConfirmInfoBarDelegate:
   MediaThrottleInfoBarDelegate* AsMediaThrottleInfoBarDelegate() override;
   base::string16 GetMessageText() const override;
+  int GetIconId() const override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
   bool Accept() override;
   bool Cancel() override;
   void InfoBarDismissed() override;
 
   DecodeRequestGrantedCallback decode_granted_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaThrottleInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_MEDIA_MEDIA_THROTTLE_INFOBAR_DELEGATE_H_