Separate ContentSettingsClient out from LocalFrameClient

third_party/WebKit/public/platform/WebContentSettingsClient.h

 // Copyright 2015 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 WebContentSettingsClient_h
 #define WebContentSettingsClient_h
 
 #include "public/platform/WebContentSettingCallbacks.h"
 
 namespace blink {
 
 class WebSecurityOrigin;
 class WebString;
 class WebURL;
 
+// This class provides the content settings information which tells
+// whether each feature is allowed or not.
 class WebContentSettingsClient {
  public:
   // Controls whether access to Web Databases is allowed for this frame.
   virtual bool allowDatabase(const WebString& name,
                              const WebString& displayName,
                              unsigned estimatedSize) {
     return true;
   }
 
   // Controls whether access to File System is allowed for this frame.
@@ skipping 75 matching lines @@
   // Notifies the client that the frame would have executed script if script
   // were enabled.
   virtual void didNotAllowScript() {}
 
   virtual ~WebContentSettingsClient() {}
 };
 
 }  // namespace blink
 
 #endif  // WebContentSettingsClient_h