Revert of Teach navigation throttles how to cancel requests in WillProcessResponse.

content/browser/frame_host/navigation_handle_impl.h

Index: content/browser/frame_host/navigation_handle_impl.h
diff --git a/content/browser/frame_host/navigation_handle_impl.h b/content/browser/frame_host/navigation_handle_impl.h
index 626465f792d8cd8ecd7a1b734d953da09df33eb2..192cdab3348d3d9dc0bd3ff51c92aa625f7e1ae7 100644
--- a/content/browser/frame_host/navigation_handle_impl.h
+++ b/content/browser/frame_host/navigation_handle_impl.h
@@ -160,18 +160,6 @@
       scoped_refptr<net::HttpResponseHeaders> response_headers,
       const ThrottleChecksFinishedCallback& callback);
 
-  // Called when the URLRequest has delivered response headers and metadata.
-  // |callback| will be called when all throttle checks have completed,
-  // allowing the caller to cancel the navigation or let it proceed.
-  // NavigationHandle will not call |callback| with a result of DEFER.
-  // If the result is PROCEED, then 'ReadyToCommitNavigation' will be called
-  // with |render_frame_host| and |response_headers| just before calling
-  // |callback|.
-  void WillProcessResponse(
-      RenderFrameHostImpl* render_frame_host,
-      scoped_refptr<net::HttpResponseHeaders> response_headers,
-      const ThrottleChecksFinishedCallback& callback);
-
   // Returns the FrameTreeNode this navigation is happening in.
   FrameTreeNode* frame_tree_node() { return frame_tree_node_; }
 
@@ -202,8 +190,6 @@
     WILL_REDIRECT_REQUEST,
     DEFERRING_REDIRECT,
     CANCELING,
-    WILL_PROCESS_RESPONSE,
-    DEFERRING_RESPONSE,
     READY_TO_COMMIT,
     DID_COMMIT,
     DID_COMMIT_ERROR_PAGE,
@@ -215,7 +201,6 @@
 
   NavigationThrottle::ThrottleCheckResult CheckWillStartRequest();
   NavigationThrottle::ThrottleCheckResult CheckWillRedirectRequest();
-  NavigationThrottle::ThrottleCheckResult CheckWillProcessResponse();
 
   // Helper function to run and reset the |complete_callback_|. This marks the
   // end of a round of NavigationThrottleChecks.