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

chrome/installer/util/google_chrome_distribution_dummy.cc

Index: chrome/installer/util/google_chrome_distribution_dummy.cc
diff --git a/chrome/installer/util/google_chrome_distribution_dummy.cc b/chrome/installer/util/google_chrome_distribution_dummy.cc
index 933c631f3b46510157ed7603d64bcbded4dd3995..74d1c35f3a4db99dcabb493d361498ed6c4487cf 100644
--- a/chrome/installer/util/google_chrome_distribution_dummy.cc
+++ b/chrome/installer/util/google_chrome_distribution_dummy.cc
@@ -116,13 +116,17 @@ string16 GoogleChromeDistribution::GetVersionKey() {
   return string16();
 }
 
+string16 GoogleChromeDistribution::GetIconFilename() {
+  NOTREACHED();
+  return string16();
+}
+
 bool GoogleChromeDistribution::GetCommandExecuteImplClsid(
     string16* handler_class_uuid) {
   NOTREACHED();
   return false;
 }
 
-
 void GoogleChromeDistribution::UpdateInstallStatus(bool system_install,
     installer::ArchiveType archive_type,
     installer::InstallStatus install_status) {