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

chrome/installer/util/shell_util.h

Index: chrome/installer/util/shell_util.h
diff --git a/chrome/installer/util/shell_util.h b/chrome/installer/util/shell_util.h
index b521527f9f3e6020bf76d3b704e01fea0e90cad8..e8f7570635edbe2ce7ea351797d44c1e3295ad7a 100644
--- a/chrome/installer/util/shell_util.h
+++ b/chrome/installer/util/shell_util.h
@@ -312,12 +312,10 @@ class ShellUtil {
       const ShellUtil::ShortcutProperties& properties,
       ShellUtil::ShortcutOperation operation);
 
-  // This method appends the Chrome icon index inside chrome.exe to the
-  // chrome.exe path passed in as input, to generate the full path for
-  // Chrome icon that can be used as value for Windows registry keys.
-  // |chrome_exe| full path to chrome.exe.
-  static string16 GetChromeIcon(BrowserDistribution* dist,
-                                const string16& chrome_exe);
+  // Combines |icon_path| with |icon_index| into a string that can be
+  // used as value for Windows registry keys.
+  static string16 GetIconString(const string16& icon_path,
+                                int icon_index);
 
   // This method returns the command to open URLs/files using chrome. Typically
   // this command is written to the registry under shell\open\command key.