Switch SupportsUserData uses to use unique_ptr.

chromecast/browser/android/cast_web_contents_activity.h

 // Copyright 2016 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 CHROMECAST_BROWSER_ANDROID_CAST_WEB_CONTENTS_ACTIVITY_H_
 #define CHROMECAST_BROWSER_ANDROID_CAST_WEB_CONTENTS_ACTIVITY_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "base/supports_user_data.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace chromecast {
 namespace shell {
 
 // Helper class to get members of the CastWebContentsActivity displaying a
 // given web_contents. This class is lazily created through the Get function and
 // will manage its own lifetime via SupportsUserData.
-class CastWebContentsActivity : base::SupportsUserData::Data {
+class CastWebContentsActivity : public base::SupportsUserData::Data {
  public:
+  ~CastWebContentsActivity() override;
+
   static bool RegisterJni(JNIEnv* env);
   static CastWebContentsActivity* Get(content::WebContents* web_contents);
 
   base::android::ScopedJavaLocalRef<jobject> GetContentVideoViewEmbedder();
   void SetContentVideoViewEmbedder(
       const base::android::JavaParamRef<jobject>& content_video_view_embedder);
 
  private:
   explicit CastWebContentsActivity(content::WebContents* web_contents);
-  ~CastWebContentsActivity() override;
 
   base::android::ScopedJavaGlobalRef<jobject> content_video_view_embedder_;
 
   DISALLOW_COPY_AND_ASSIGN(CastWebContentsActivity);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_ANDROID_CAST_WEB_CONTENTS_ACTIVITY_H_