Pulling user experiment code from BrowserDistribution to a new class.

chrome/installer/util/chrome_app_host_operations.cc

Index: chrome/installer/util/chrome_app_host_operations.cc
diff --git a/chrome/installer/util/chrome_app_host_operations.cc b/chrome/installer/util/chrome_app_host_operations.cc
index 3690196cd422ac33e7899e398638b17c9e695a50..637d52c6d0a22122177a2ca5c6482e68859ac70c 100644
--- a/chrome/installer/util/chrome_app_host_operations.cc
+++ b/chrome/installer/util/chrome_app_host_operations.cc
@@ -120,4 +120,14 @@ void ChromeAppHostOperations::AddDefaultShortcutProperties(
   }
 }
 
+void ChromeAppHostOperations::LaunchUserExperiment(
+    const base::FilePath& setup_path,
+    const std::set<std::wstring>& options,
+    InstallStatus status,
+    bool system_level) const {
+  // No experiments yet.  If adding some in the future, need to have
+  // ChromeAppHostDistribution::HasUserExperiments() return true.
+  NOTREACHED();
+}
+
 }  // namespace installer