Use FrameTreeNode ID as frameId in extension APIs

content/public/browser/resource_request_info.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_RESOURCE_REQUEST_INFO_H_
 #define CONTENT_PUBLIC_BROWSER_RESOURCE_REQUEST_INFO_H_
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 #include "content/public/common/resource_type.h"
@@ skipping 58 matching lines @@
 
   // The IPC route identifier of the RenderFrame.
   // TODO(jam): once all navigation and resource requests are sent between
   // frames and RenderView/RenderViewHost aren't involved we can remove this and
   // just use GetRouteID above.
   virtual int GetRenderFrameID() const = 0;
 
   // True if GetRenderFrameID() represents a main frame in the RenderView.
   virtual bool IsMainFrame() const = 0;
 
-  // True if GetParentRenderFrameID() represents a main frame in the RenderView.
+  // True if parent frame of frame represents a main frame in the RenderView.

[Charlie Reis, 2015/11/03 00:23:49]

nit: True if the parent frame of the frame that sent this request represents a
main frame in the RenderView.

[robwu, 2015/11/03 10:03:02]

Done (using "the frame's parent" to fit the comment on one line).

   virtual bool ParentIsMainFrame() const = 0;
 
-  // Routing ID of parent frame of frame that sent this resource request.
-  // -1 if unknown / invalid.
-  virtual int GetParentRenderFrameID() const = 0;
-
   // Returns the associated resource type.
   virtual ResourceType GetResourceType() const = 0;
 
   // Returns the process type that initiated this request.
   virtual int GetProcessType() const = 0;
 
   // Returns the associated referrer policy.
   virtual blink::WebReferrerPolicy GetReferrerPolicy() const = 0;
 
   // Returns the associated visibility state at the time the request was started
@@ skipping 28 matching lines @@
   // Whether this is a download.
   virtual bool IsDownload() const = 0;
 
  protected:
   virtual ~ResourceRequestInfo() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RESOURCE_REQUEST_INFO_H_