easy-unlock: Turn on by default.

components/proximity_auth/switches.cc

 // Copyright 2014 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 "components/proximity_auth/switches.h"
 
 namespace proximity_auth {
 namespace switches {
 
 // Overrides the default URL for Google APIs (https://www.googleapis.com) used
 // by CryptAuth.
 const char kCryptAuthHTTPHost[] = "cryptauth-http-host";
 
 // Disable Easy sign-in.
 const char kDisableEasySignin[] = "disable-easy-signin";
 
 // Disable Easy unlock.
 const char kDisableEasyUnlock[] = "disable-easy-unlock";
 
+// TODO(xiyuan): Remove obsolete enable flags since feature is on by default.
+//    Also consolidate the two flags into one after http://crbug.com/439638.
+
 // Enable Easy sign-in.
 const char kEnableEasySignin[] = "enable-easy-signin";
 
 // Enable Easy unlock.
 const char kEnableEasyUnlock[] = "enable-easy-unlock";
 
 // Enables close proximity detection. This allows the user to set a setting to
 // require very close proximity between the remote device and the local device
 // in order to unlock the local device, which trades off convenience for
 // security.
 const char kEnableProximityDetection[] =
     "enable-proximity-auth-proximity-detection";
 
 }  // namespace switches
 }  // namespace proximity_auth