Add default icon to app_host.exe, and use it in shortcuts during installation.

chrome/installer/util/google_chrome_distribution.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.
 //
 // This file defines specific implementation of BrowserDistribution class for
 // Google Chrome.
 
 #include "chrome/installer/util/google_chrome_distribution.h"
 
 #include <vector>
@@ skipping 520 matching lines @@
          L"Google Chrome";
 }
 
 string16 GoogleChromeDistribution::GetVersionKey() {
   string16 key(google_update::kRegPathClients);
   key.append(L"\\");
   key.append(product_guid());
   return key;
 }
 
+string16 GoogleChromeDistribution::GetIconFilename() {
+  return installer::kChromeExe;
+}
+
 bool GoogleChromeDistribution::GetCommandExecuteImplClsid(
     string16* handler_class_uuid) {
   if (handler_class_uuid)
     *handler_class_uuid = kCommandExecuteImplUuid;
   return true;
 }
 
 // This method checks if we need to change "ap" key in Google Update to try
 // full installer as fall back method in case incremental installer fails.
 // - If incremental installer fails we append a magic string ("-full"), if
@@ skipping 311 matching lines @@
   // we waited for chrome to exit so the uninstall would not detect chrome
   // running.
   bool system_level_toast = CommandLine::ForCurrentProcess()->HasSwitch(
       installer::switches::kSystemLevelToast);
 
   CommandLine cmd(InstallUtil::GetChromeUninstallCmd(system_level_toast,
                                                      GetType()));
   base::LaunchProcess(cmd, base::LaunchOptions(), NULL);
 }
 #endif