Remove unused ContentBrowserClient::IsFastShutdownPossible.

android_webview/browser/aw_content_browser_client.h

 // 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.
 
 #ifndef ANDROID_WEBVIEW_LIB_AW_CONTENT_BROWSER_CLIENT_H_
 #define ANDROID_WEBVIEW_LIB_AW_CONTENT_BROWSER_CLIENT_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 90 matching lines @@
                        const blink::WebWindowFeatures& features,
                        bool user_gesture,
                        bool opener_suppressed,
                        content::ResourceContext* context,
                        int render_process_id,
                        int opener_render_view_id,
                        int opener_render_frame_id,
                        bool* no_javascript_access) override;
   void ResourceDispatcherHostCreated() override;
   net::NetLog* GetNetLog() override;
-  bool IsFastShutdownPossible() override;
   void ClearCache(content::RenderFrameHost* rfh) override;
   void ClearCookies(content::RenderFrameHost* rfh) override;
   base::FilePath GetDefaultDownloadDirectory() override;
   std::string GetDefaultDownloadName() override;
   void DidCreatePpapiPlugin(content::BrowserPpapiHost* browser_host) override;
   bool AllowPepperSocketAPI(
       content::BrowserContext* browser_context,
       const GURL& url,
       bool private_api,
       const content::SocketPermissionRequest* params) override;
@@ skipping 22 matching lines @@
   std::unique_ptr<AwWebPreferencesPopulater> preferences_populater_;
 
   JniDependencyFactory* native_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AwContentBrowserClient);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_LIB_AW_CONTENT_BROWSER_CLIENT_H_