Remove unused routing ID param from Did(Show|Destroy)FullscreenWidget.

content/browser/media/capture/web_contents_tracker.cc

 // Copyright (c) 2013 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 "content/browser/media/capture/web_contents_tracker.h"
 
 #include "base/thread_task_runner_handle.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 145 matching lines @@
   task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&WebContentsTracker::MaybeDoResizeCallback, this));
 }
 
 void WebContentsTracker::WebContentsDestroyed() {
   Observe(NULL);
   OnPossibleTargetChange(false);
 }
 
-void WebContentsTracker::DidShowFullscreenWidget(int routing_id) {
+void WebContentsTracker::DidShowFullscreenWidget() {
   OnPossibleTargetChange(false);
 }
 
-void WebContentsTracker::DidDestroyFullscreenWidget(int routing_id) {
+void WebContentsTracker::DidDestroyFullscreenWidget() {
   OnPossibleTargetChange(false);
 }
 
 }  // namespace content