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

chrome/browser/ui/webui/local_discovery/local_discovery_ui_browsertest.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 "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 220 matching lines @@
 
 const char kURLCloudPrintConfirm[] =
     "https://www.google.com/cloudprint/confirm?token=MySampleToken";
 
 const char kURLRegisterComplete[] =
     "http://1.2.3.4:8888/privet/register?action=complete&user=user@host.com";
 
 const char kURLGaiaToken[] =
     "https://accounts.google.com/o/oauth2/token";
 
-const char kSampleServiceName[] = "myService._privet._tcp.local";
-const char kSampleDeviceID[] = "MyFakeID";
-const char kSampleDeviceHost[] = "myservice.local";
 const char kSampleUser[] = "user@host.com";
 
 class TestMessageLoopCondition {
  public:
   TestMessageLoopCondition() : signaled_(false),
                                waiting_(false) {
   }
 
   ~TestMessageLoopCondition() {
   }
@@ skipping 246 matching lines @@
       kAnnouncePacketRegistered, sizeof(kAnnouncePacketRegistered));
 
   base::MessageLoop::current()->RunUntilIdle();
 
   EXPECT_TRUE(WebUIBrowserTest::RunJavascriptTest("expectRegisterDone"));
 }
 
 }  // namespace
 
 }  // namespace local_discovery