[Android] Use resource throttle instead of HandleExternalProtocol.

chrome/browser/ui/android/external_protocol_dialog_android.cc

 // 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.
 
+#include "chrome/browser/external_protocol/external_protocol_handler.h"
+
 #include "base/logging.h"
-#include "chrome/browser/component/navigation_interception/intercept_navigation_delegate.h"
-#include "chrome/browser/external_protocol/external_protocol_handler.h"
-#include "chrome/browser/tab_contents/tab_util.h"
-#include "content/public/browser/web_contents.h"
-
-using content::WebContents;
 
 // static
 void ExternalProtocolHandler::RunExternalProtocolDialog(
     const GURL& url, int render_process_host_id, int routing_id) {
-  WebContents* web_contents = tab_util::GetWebContentsByID(
-      render_process_host_id, routing_id);
-  if (!web_contents)
-    return;
-  navigation_interception::InterceptNavigationDelegate* delegate =
-      navigation_interception::InterceptNavigationDelegate::Get(web_contents);
-  if (!delegate)
-    return;
-
-  // TODO(jknotten): The call to ShouldIgnoreNavigation returns false if there
-  // are no applications that can handle the given URL. In this case, an error
-  // page should be displayed to the user.
-  delegate->ShouldIgnoreNavigation(url, true /* has_user_gesture */ );
+  // Chrome on Android uses a throttle-based mechansim to intercept links
+  // so that the user may choose to run an Android application instead of
+  // loading the link in the browser. The throttle is also used to handle
+  // external protocols, so this code should not be reachable.
+  NOTREACHED();
 }