Remove task.h and finish base::Bind() migration.

chrome/browser/net/net_pref_observer.cc

 // Copyright (c) 2011 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/net/net_pref_observer.h"
 
 #include "base/bind.h"
-#include "base/task.h"
 #include "chrome/browser/net/predictor.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_details.h"
 #include "net/http/http_stream_factory.h"
 #include "net/url_request/url_request_throttler_manager.h"
@@ skipping 75 matching lines @@
                              true,
                              PrefService::UNSYNCABLE_PREF);
 
   // For users who created their profile while throttling was off by
   // default, but have never explicitly turned it on or off, we turn
   // it on which is the new default.
   if (prefs->GetBoolean(prefs::kHttpThrottlingMayExperiment)) {
     prefs->SetBoolean(prefs::kHttpThrottlingEnabled, true);
   }
 }