This patch changes participation condition of bookmark prompt experiment to:
 - 1% of new users on Canary channel
 - One month
rather than using variations service.

Checking new user, aka new installation, is as same as
  https://chromiumcodereview.appspot.com/11363062

We'll change the start date for stable channel once it is fixed.

BUG=160151

Review URL: https://chromiumcodereview.appspot.com/11412002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@168170 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index fb4ec417..0b5f4bb71 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -803,7 +803,8 @@
 #endif
 
 #if !defined(OS_ANDROID)
-  if (browser_defaults::bookmarks_enabled)
+  if (browser_defaults::bookmarks_enabled &&
+      BookmarkPromptController::IsEnabled())
     bookmark_prompt_controller_.reset(new BookmarkPromptController());
 #endif
 }