Mandate unique_ptr for base::IDMap in IDMapOwnPointer mode.

chrome/browser/ui/tab_contents/core_tab_helper.cc

 // 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.
 
 #include "chrome/browser/ui/tab_contents/core_tab_helper.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 104 matching lines @@
                  base::Unretained(this),
                  src_url));
 }
 
 void CoreTabHelper::RequestThumbnailForContextNode(
     content::RenderFrameHost* render_frame_host,
     int minimum_size,
     gfx::Size maximum_size,
     const ContextNodeThumbnailCallback& callback) {
   int callback_id = thumbnail_callbacks_.Add(
-      new ContextNodeThumbnailCallback(callback));
+      base::MakeUnique<ContextNodeThumbnailCallback>(callback));
 
   render_frame_host->Send(
       new ChromeViewMsg_RequestThumbnailForContextNode(
           render_frame_host->GetRoutingID(),
           minimum_size,
           maximum_size,
           callback_id));
 }
 
 // static
@@ skipping 256 matching lines @@
     DCHECK(!content_type.empty());
     open_url_params.uses_post = true;
     open_url_params.post_data = content::ResourceRequestBody::CreateFromBytes(
         post_data.data(), post_data.size());
     open_url_params.extra_headers += base::StringPrintf(
         "%s: %s\r\n", net::HttpRequestHeaders::kContentType,
         content_type.c_str());
   }
   web_contents()->OpenURL(open_url_params);
 }