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

chrome/installer/util/google_chrome_distribution.cc

Index: chrome/installer/util/google_chrome_distribution.cc
diff --git a/chrome/installer/util/google_chrome_distribution.cc b/chrome/installer/util/google_chrome_distribution.cc
index 4232530544507de8097d5063f80b7a21b1abb7a3..106c588e730536ea74a46c310f06a00d80ed69d9 100644
--- a/chrome/installer/util/google_chrome_distribution.cc
+++ b/chrome/installer/util/google_chrome_distribution.cc
@@ -538,6 +538,10 @@ string16 GoogleChromeDistribution::GetVersionKey() {
   return key;
 }
 
+string16 GoogleChromeDistribution::GetIconFilename() {
+  return installer::kChromeExe;
+}
+
 bool GoogleChromeDistribution::GetCommandExecuteImplClsid(
     string16* handler_class_uuid) {
   if (handler_class_uuid)