Clean up ownership in WebUI creation.

content/public/browser/web_contents.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 CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 
 #include <stdint.h>
 
+#include <memory>
 #include <set>
 
 #include "base/callback_forward.h"
 #include "base/files/file_path.h"
 #include "base/process/kill.h"
 #include "base/strings/string16.h"
 #include "base/supports_user_data.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/invalidate_type.h"
@@ skipping 266 matching lines @@
 
   // Returns the theme color for the underlying content as set by the
   // theme-color meta tag.
   virtual SkColor GetThemeColor() const = 0;
 
   // Create a WebUI page for the given url. In most cases, this doesn't need to
   // be called by embedders since content will create its own WebUI objects as
   // necessary. However if the embedder wants to create its own WebUI object and
   // keep track of it manually, it can use this. |frame_name| is used to
   // identify the frame and cannot be empty.
-  virtual WebUI* CreateSubframeWebUI(const GURL& url,
-                                     const std::string& frame_name) = 0;
+  virtual std::unique_ptr<WebUI> CreateSubframeWebUI(
+      const GURL& url,
+      const std::string& frame_name) = 0;
 
   // Returns the committed WebUI if one exists, otherwise the pending one.
   virtual WebUI* GetWebUI() const = 0;
   virtual WebUI* GetCommittedWebUI() const = 0;
 
   // Allows overriding the user agent used for NavigationEntries it owns.
   virtual void SetUserAgentOverride(const std::string& override) = 0;
   virtual const std::string& GetUserAgentOverride() const = 0;
 
   // Enable the accessibility tree for this WebContents in the renderer,
@@ skipping 448 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_