Ensure media permission requests are correctly cancelled when permission prompts are ignored

chrome/browser/media/webrtc/media_stream_device_permission_context.cc

 // Copyright 2015 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/media/webrtc/media_stream_device_permission_context.h"
 #include "base/feature_list.h"
 #include "chrome/browser/media/webrtc/media_stream_device_permissions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/pref_names.h"
@@ skipping 82 matching lines @@
 
   return setting;
 }
 
 void MediaStreamDevicePermissionContext::ResetPermission(
     const GURL& requesting_origin,
     const GURL& embedding_origin) {
   NOTREACHED() << "ResetPermission is not implemented";
 }
 
-void MediaStreamDevicePermissionContext::CancelPermissionRequest(
-    content::WebContents* web_contents,
-    const PermissionRequestID& id) {
-  NOTREACHED() << "CancelPermissionRequest is not implemented";
-}
-
 bool MediaStreamDevicePermissionContext::IsRestrictedToSecureOrigins() const {
   return base::FeatureList::IsEnabled(
       features::kRequireSecureOriginsForPepperMediaRequests);
 }