Clean up unused constant globals

chrome/browser/jankometer.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/jankometer.h"
 
 #include <limits>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 30 matching lines @@
 const int kMaxIOMessageDelayMs = 200;
 #else
 const int kMaxUIMessageDelayMs = 500;
 const int kMaxIOMessageDelayMs = 400;
 #endif
 
 // Maximum processing time (excluding queueing delay) for a message before
 // considering it delayed.
 const int kMaxMessageProcessingMs = 100;
 
+#if defined(OS_WIN)
 // TODO(brettw) Consider making this a pref.
 const bool kPlaySounds = false;
+#endif
 
 //------------------------------------------------------------------------------
 // Provide a special watchdog to make it easy to set the breakpoint on this
 // class only.
 class JankWatchdog : public base::Watchdog {
  public:
   JankWatchdog(const TimeDelta& duration,
                const std::string& thread_watched_name,
                bool enabled)
       : Watchdog(duration, thread_watched_name, enabled),
@@ skipping 353 matching lines @@
     delete ui_observer;
     ui_observer = NULL;
   }
   if (io_observer) {
     // IO thread can't be running when we remove observers.
     DCHECK((!g_browser_process) || !(g_browser_process->io_thread()));
     delete io_observer;
     io_observer = NULL;
   }
 }