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

chrome/browser/chromeos/boot_times_loader.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/boot_times_loader.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 68 matching lines @@
 static const base::FilePath::CharType kLogPath[] = FPL("/tmp");
 // Dir log{in,out} logs are located in.
 static const base::FilePath::CharType kLoginLogPath[] =
     FPL("/home/chronos/user");
 // Prefix for the time measurement files.
 static const base::FilePath::CharType kUptimePrefix[] = FPL("uptime-");
 // Prefix for the disk usage files.
 static const base::FilePath::CharType kDiskPrefix[] = FPL("disk-");
 // Name of the time that Chrome's main() is called.
 static const base::FilePath::CharType kChromeMain[] = FPL("chrome-main");
-// Delay in milliseconds between file read attempts.
-static const int64 kReadAttemptDelayMs = 250;
 // Delay in milliseconds before writing the login times to disk.
 static const int64 kLoginTimeWriteDelayMs = 3000;
 
 // Names of login stats files.
 static const base::FilePath::CharType kLoginSuccess[] = FPL("login-success");
 static const base::FilePath::CharType kChromeFirstRender[] =
     FPL("chrome-first-render");
 
 // Names of login UMA values.
 static const char kUmaLogin[] = "BootTime.Login";
@@ skipping 279 matching lines @@
           GetRenderWidgetHost(&web_contents->GetController());
       render_widget_hosts_loading_.erase(render_widget_host);
       break;
     }
     default:
       break;
   }
 }
 
 }  // namespace chromeos