Use FrameTreeNode ID as frameId in extension APIs

content/public/browser/resource_request_info.h

Index: content/public/browser/resource_request_info.h
diff --git a/content/public/browser/resource_request_info.h b/content/public/browser/resource_request_info.h
index e65bce062848fc401f860b40d7b44e249530e831..d5ee296b659f6b4966fe55ff341bdf69785c43ed 100644
--- a/content/public/browser/resource_request_info.h
+++ b/content/public/browser/resource_request_info.h
@@ -94,13 +94,9 @@ class ResourceRequestInfo {
   // 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 the frame's parent represents a main frame in the RenderView.
   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;