Update SupportsUserData uses with unique_ptr.

content/test/web_contents_observer_sanity_checker.h

 // Copyright 2014 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_TEST_WEB_CONTENTS_OBSERVER_SANITY_CHECKER_H_
 #define CONTENT_TEST_WEB_CONTENTS_OBSERVER_SANITY_CHECKER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 12 matching lines @@
 // checks are test-only code designed to find bugs in the implementation of the
 // content layer by validating the contract between WebContents and its
 // observers.
 //
 // For example, WebContentsObserver::RenderFrameCreated announces the existence
 // of a new RenderFrameHost, so that method call must occur before the
 // RenderFrameHost is referenced by some other WebContentsObserver method.
 class WebContentsObserverSanityChecker : public WebContentsObserver,
                                          public base::SupportsUserData::Data {
  public:
+  ~WebContentsObserverSanityChecker() override;
+
   // Enables these checks on |web_contents|. Usually ContentBrowserSanityChecker
   // should call this for you.
   static void Enable(WebContents* web_contents);
 
   // WebContentsObserver implementation.
   void RenderFrameCreated(RenderFrameHost* render_frame_host) override;
   void RenderFrameDeleted(RenderFrameHost* render_frame_host) override;
   void RenderFrameForInterstitialPageCreated(
       RenderFrameHost* render_frame_host) override;
   void RenderFrameHostChanged(RenderFrameHost* old_host,
@@ skipping 26 matching lines @@
   void MediaStoppedPlaying(const MediaPlayerInfo& media_info,
                            const MediaPlayerId& id) override;
   bool OnMessageReceived(const IPC::Message& message,
                          RenderFrameHost* render_frame_host) override;
   void WebContentsDestroyed() override;
   void DidStartLoading() override;
   void DidStopLoading() override;
 
  private:
   explicit WebContentsObserverSanityChecker(WebContents* web_contents);
-  ~WebContentsObserverSanityChecker() override;
 
   std::string Format(RenderFrameHost* render_frame_host);
   void AssertRenderFrameExists(RenderFrameHost* render_frame_host);
   void AssertMainFrameExists();
 
   bool NavigationIsOngoing(NavigationHandle* navigation_handle);
 
   void EnsureStableParentValue(RenderFrameHost* render_frame_host);
   bool HasAnyChildren(RenderFrameHost* render_frame_host);
 
@@ skipping 10 matching lines @@
   bool is_loading_;
 
   bool web_contents_destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserverSanityChecker);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_WEB_CONTENTS_OBSERVER_SANITY_CHECKER_H_