Enable the VariationsService on official builds when --variations-service-url is provided.

chrome/common/chrome_switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 
 namespace switches {
@@ skipping 1317 matching lines @@
 const char kMaxSpdyConcurrentStreams[]      = "max-spdy-concurrent-streams";
 
 // Specifies the user data directory, which is where the browser will look for
 // all of its state.
 const char kUserDataDir[]                   = "user-data-dir";
 
 // Uses the GAIA web-based signin flow instead of the native UI signin flow.
 const char kUseWebBasedSigninFlow[]         = "use-web-based-signin-flow";
 
 // Specifies a custom URL for the server which reports variation data to the
-// client. See variations_service.cc.
+// client. Specifying this switch enables the Variations service on
+// unofficial builds. See variations_service.cc.
 const char kVariationsServerURL[]            = "variations-server-url";
 
 // Prints version information and quits.
 const char kVersion[]                       = "version";
 
 // Requests that Chrome connect to a remote viewer process using an IPC
 // channel of the given name.
 const char kViewerConnection[]              = "viewer-connection";
 
 // Cycle through a series of URLs listed in the specified file.
@@ skipping 263 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches