ChromeOS: enable SystemTimezoneAutomaticDetectionPolicy by default.

chrome/browser/policy/policy_browsertest.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 <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
 #include <string>
@@ skipping 3893 matching lines @@
  public:
   ChromeOSPolicyTest() {}
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
     PolicyTest::SetUpCommandLine(command_line);
     command_line->AppendSwitchASCII(chromeos::switches::kLoginUser,
                                     cryptohome_id1_.id());
     command_line->AppendSwitchASCII(chromeos::switches::kLoginProfile, "hash");
     command_line->AppendSwitch(
         chromeos::switches::kAllowFailedPolicyFetchForTest);
-
-    command_line->AppendSwitch(
-        chromeos::switches::kEnableSystemTimezoneAutomaticDetectionPolicy);
   }
 
  protected:
   const AccountId test_account_id1_ = AccountId::FromUserEmail(kTestUser1);
   const cryptohome::Identification cryptohome_id1_ =
       cryptohome::Identification(test_account_id1_);
 
   // Logs in |account_id|.
   void LogIn(const AccountId& account_id, const std::string& user_id_hash) {
     user_manager::UserManager::Get()->UserLoggedIn(account_id, user_id_hash,
@@ skipping 106 matching lines @@
 
   SetEmptyPolicy();
   // Policy not set.
   CheckSystemTimezoneAutomaticDetectionPolicyUnset();
   EXPECT_TRUE(CheckResolveTimezoneByGeolocation(true, false));
   EXPECT_TRUE(manager->TimeZoneResolverShouldBeRunningForTests());
 }
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace policy