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

chrome/installer/util/browser_distribution.cc

Index: chrome/installer/util/browser_distribution.cc
diff --git a/chrome/installer/util/browser_distribution.cc b/chrome/installer/util/browser_distribution.cc
index 26f5a2f9b0c7994d9f84ad8a8329965bd66c4574..d6dfd617115bd473d58e91c4516b0bffe4404999 100644
--- a/chrome/installer/util/browser_distribution.cc
+++ b/chrome/installer/util/browser_distribution.cc
@@ -225,7 +225,13 @@ bool BrowserDistribution::CanCreateDesktopShortcuts() {
   return true;
 }
 
+string16 BrowserDistribution::GetIconFile() {
+  return string16();
+}
+
 int BrowserDistribution::GetIconIndex() {
+  // Assuming that main icon appears first alphabetically, e.g.,
+  // as IDR_MAINFRAME.
   return 0;
 }