Add WebUIDataSourceImpl::DisableReplaceExistingSource

content/public/browser/web_ui_data_source.h

 // Copyright (c) 2013 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_UI_DATA_SOURCE_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_UI_DATA_SOURCE_H_
 
 #include "base/callback.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
@@ skipping 60 matching lines @@
   typedef base::Callback<bool(const std::string&, const GotDataCallback&)>
       HandleRequestCallback;
 
   // Allows a caller to add a filter for URL requests.
   virtual void SetRequestFilter(const HandleRequestCallback& callback) = 0;
 
   // The following map to methods on URLDataSource. See the documentation there.
   // NOTE: it's not acceptable to call DisableContentSecurityPolicy for new
   // pages, see URLDataSource::ShouldAddContentSecurityPolicy and talk to
   // tsepez.
+
+  // Currently only used by embedders for WebUIs with multiple instances, could
+  // have been useful for NTP as well if it wasn't implementing URLDataSource

[jam, 2013/08/25 07:22:39]

nit: please remove everything after the comment. per comment 11 NTP can't use
this, and either way it's a layering violation to mention a chrome concept in
content.

+  // itself.
+  virtual void DisableReplaceExistingSource() = 0;
   virtual void DisableContentSecurityPolicy() = 0;
   virtual void OverrideContentSecurityPolicyObjectSrc(
       const std::string& data) = 0;
   virtual void OverrideContentSecurityPolicyFrameSrc(
       const std::string& data) = 0;
   virtual void DisableDenyXFrameOptions() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_UI_DATA_SOURCE_H_