Pulling user experiment code from BrowserDistribution to a new class.

chrome/installer/util/product.h

Index: chrome/installer/util/product.h
diff --git a/chrome/installer/util/product.h b/chrome/installer/util/product.h
index cba5bc2f0637cc7a274d1ec6a63fe16849c6d270..5c5fe0b94426be344d6429e18e3c0ca37fa9119b 100644
--- a/chrome/installer/util/product.h
+++ b/chrome/installer/util/product.h
@@ -129,6 +129,10 @@ class Product {
       const base::FilePath& target_exe,
       ShellUtil::ShortcutProperties* properties) const;
 
+  void LaunchUserExperiment(const base::FilePath& setup_path,
+                            InstallStatus status,
+                            bool system_level) const;
+
  protected:
   enum CacheStateFlags {
     MSI_STATE = 0x01