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

chrome/browser/chromeos/contacts/gdata_contacts_service_unittest.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/browser/chromeos/contacts/gdata_contacts_service.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
@@ skipping 13 matching lines @@
 #include "net/test/embedded_test_server/http_response.h"
 #include "net/url_request/url_request_test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/size.h"
 
 using content::BrowserThread;
 
 namespace contacts {
 namespace {
 
-const char kTestGDataAuthToken[] = "testtoken";
-
 // Filename of JSON feed containing contact groups.
 const char kGroupsFeedFilename[] = "/groups.json";
 
 // Width and height of /photo.png on the test server.
 const int kPhotoSize = 48;
 
 // Initializes |contact| using the passed-in values.
 void InitContact(const std::string& contact_id,
                  const std::string& rfc_3339_update_time,
                  bool deleted,
@@ skipping 282 matching lines @@
   scoped_ptr<contacts::Contact> contact2(new contacts::Contact);
   InitContact("http://example.com/2", "2012-06-21T16:20:13.208Z",
               false, "Bob Smith", "Bob", "", "Smith", "", "",
               contact2.get());
   EXPECT_EQ(contacts::test::VarContactsToString(
                 2, contact1.get(), contact2.get()),
             contacts::test::ContactsToString(*contacts));
 }
 
 }  // namespace contacts