linux and chromeos: Turn on -Wunused-const-variable.

chrome/browser/chromeos/login/existing_user_controller_auto_login_unittest.cc

 // Copyright 2013 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 <string>
 
 #include "base/message_loop/message_loop.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/login/existing_user_controller.h"
 #include "chrome/browser/chromeos/login/mock_login_display.h"
@@ skipping 16 matching lines @@
 using testing::ReturnNull;
 using testing::_;
 
 namespace chromeos {
 
 namespace {
 
 const char kAutoLoginAccountId[] = "public_session_user@localhost";
 // These values are only used to test the configuration.  They don't
 // delay the test.
-const int kAutoLoginNoDelay = 0;
 const int kAutoLoginDelay1 = 60000;
 const int kAutoLoginDelay2 = 180000;
 
 }  // namespace
 
 class ExistingUserControllerAutoLoginTest : public ::testing::Test {
  protected:
   ExistingUserControllerAutoLoginTest()
       : auto_login_user_id_(policy::GenerateDeviceLocalAccountUserId(
             kAutoLoginAccountId,
@@ skipping 230 matching lines @@
   ConfigureAutoLogin();
   ASSERT_TRUE(auto_login_timer());
   EXPECT_FALSE(auto_login_timer()->IsRunning());
   EXPECT_EQ(auto_login_timer()->GetCurrentDelay().InMilliseconds(),
             kAutoLoginDelay2);
   EXPECT_EQ(auto_login_username(), "");
   EXPECT_EQ(auto_login_delay(), kAutoLoginDelay2);
 }
 
 }  // namespace chromeos