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

chrome/installer/util/browser_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 a class that contains various method related to branding.
 // It provides only default implementations of these methods. Usually to add
 // specific branding, we will need to extend this class with a custom
 // implementation.
 
 #include "chrome/installer/util/browser_distribution.h"
@@ skipping 207 matching lines @@
 }
 
 bool BrowserDistribution::CanSetAsDefault() {
   return true;
 }
 
 bool BrowserDistribution::CanCreateDesktopShortcuts() {
   return true;
 }
 
+string16 BrowserDistribution::GetIconFilename() {
+  return string16();
+}
+
 int BrowserDistribution::GetIconIndex() {
+  // Assuming that main icon appears first alphabetically in the resource file
+  // for GetIconFilename().
   return 0;
 }
 
 bool BrowserDistribution::GetChromeChannel(string16* channel) {
   return false;
 }
 
 bool BrowserDistribution::GetCommandExecuteImplClsid(
     string16* handler_class_uuid) {
   if (handler_class_uuid)
@@ skipping 16 matching lines @@
     const Version& version, const installer::Product& product,
     bool system_level) {
 }
 
 
 void BrowserDistribution::InactiveUserToastExperiment(int flavor,
     const string16& experiment_group,
     const installer::Product& installation,
     const FilePath& application_path) {
 }