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

chrome/installer/util/browser_distribution.h

Index: chrome/installer/util/browser_distribution.h
diff --git a/chrome/installer/util/browser_distribution.h b/chrome/installer/util/browser_distribution.h
index 7ec1eacd79bcc443d426aa1f41ea32818716e951..f6b568d3de3e34d90b3dddbeca1c747a141b2d9c 100644
--- a/chrome/installer/util/browser_distribution.h
+++ b/chrome/installer/util/browser_distribution.h
@@ -121,6 +121,11 @@ class BrowserDistribution {
 
   virtual bool CanCreateDesktopShortcuts();
 
+  // Returns the executable filename (not path) that contains the product icon.
+  virtual string16 GetIconFilename();
+
+  // Returns the index of the icon for the product, inside the file specified by
+  // GetIconFilename().
   virtual int GetIconIndex();
 
   virtual bool GetChromeChannel(string16* channel);