Remove unused ContentBrowserClient::IsFastShutdownPossible.

content/public/browser/content_browser_client.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 "content/public/browser/content_browser_client.h"
 
 #include "base/files/file_path.h"
 #include "base/guid.h"
 #include "build/build_config.h"
 #include "content/public/browser/client_certificate_delegate.h"
@@ skipping 289 matching lines @@
 
 SpeechRecognitionManagerDelegate*
     ContentBrowserClient::CreateSpeechRecognitionManagerDelegate() {
   return nullptr;
 }
 
 net::NetLog* ContentBrowserClient::GetNetLog() {
   return nullptr;
 }
 
-bool ContentBrowserClient::IsFastShutdownPossible() {
-  return true;
-}
-
 base::FilePath ContentBrowserClient::GetDefaultDownloadDirectory() {
   return base::FilePath();
 }
 
 std::string ContentBrowserClient::GetDefaultDownloadName() {
   return std::string();
 }
 
 base::FilePath ContentBrowserClient::GetShaderDiskCacheDirectory() {
   return base::FilePath();
@@ skipping 102 matching lines @@
 #if defined(VIDEO_HOLE)
 ExternalVideoSurfaceContainer*
 ContentBrowserClient::OverrideCreateExternalVideoSurfaceContainer(
     WebContents* web_contents) {
   NOTREACHED() << "Hole-punching is not supported. See crbug.com/469348.";
   return nullptr;
 }
 #endif
 
 }  // namespace content