(re-commit) Implement installation of the Chrome App Host.

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 67380371ce80585b14b07e5d5793fa689614b085..4f609c9d821af30447dc7a8c676498b577b8f38e 100644
--- a/chrome/installer/util/browser_distribution.h
+++ b/chrome/installer/util/browser_distribution.h
@@ -29,6 +29,7 @@ class BrowserDistribution {
     CHROME_BROWSER,
     CHROME_FRAME,
     CHROME_BINARIES,
+    CHROME_APP_HOST,
     NUM_TYPES
   };
 
@@ -46,12 +47,6 @@ class BrowserDistribution {
                           // experiment but does not participate.
   };
 
-  // An array of the Types representing products;
-  static const Type kProductTypes[];
-
-  // The number of elements in the array |kProductTypes|.
-  static const size_t kNumProductTypes;
-
   virtual ~BrowserDistribution() {}
 
   static BrowserDistribution* GetDistribution();