Remove PrefObserver usage, batch 9.

chrome/browser/profiles/gaia_info_update_service.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/profiles/gaia_info_update_service.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 14 matching lines @@
 
 // If the users's GAIA info is very out of date then wait at least this long
 // before starting an update. This avoids slowdown during startup.
 const int kMinUpdateIntervalSeconds = 5;
 
 } // namespace
 
 GAIAInfoUpdateService::GAIAInfoUpdateService(Profile* profile)
     : profile_(profile) {
   PrefService* prefs = profile_->GetPrefs();
-  username_pref_.Init(prefs::kGoogleServicesUsername, prefs, this);
+  username_pref_.Init(prefs::kGoogleServicesUsername, prefs,
+                      base::Bind(&GAIAInfoUpdateService::OnUsernameChanged,
+                                 base::Unretained(this)));
 
   last_updated_ = base::Time::FromInternalValue(
       prefs->GetInt64(prefs::kProfileGAIAInfoUpdateTime));
   ScheduleNextUpdate();
 }
 
 GAIAInfoUpdateService::~GAIAInfoUpdateService() {
 }
 
 void GAIAInfoUpdateService::Update() {
@@ skipping 111 matching lines @@
     ProfileDownloader* downloader) {
   profile_image_downloader_.reset();
 
   // Save the last updated time.
   last_updated_ = base::Time::Now();
   profile_->GetPrefs()->SetInt64(prefs::kProfileGAIAInfoUpdateTime,
                                  last_updated_.ToInternalValue());
   ScheduleNextUpdate();
 }
 
-void GAIAInfoUpdateService::OnPreferenceChanged(PrefServiceBase* service,
-                                                const std::string& pref_name) {
-  if (prefs::kGoogleServicesUsername == pref_name)
-    OnUsernameChanged();
-}
-
 void GAIAInfoUpdateService::OnUsernameChanged() {
   ProfileInfoCache& cache =
       g_browser_process->profile_manager()->GetProfileInfoCache();
   size_t profile_index = cache.GetIndexOfProfileWithPath(profile_->GetPath());
   if (profile_index == std::string::npos)
     return;
 
   std::string username = profile_->GetPrefs()->GetString(
       prefs::kGoogleServicesUsername);
   if (username.empty()) {
@@ skipping 21 matching lines @@
   const base::TimeDelta update_delta = base::Time::Now() - last_updated_;
 
   base::TimeDelta delta;
   if (update_delta < base::TimeDelta() || update_delta > desired_delta)
     delta = base::TimeDelta::FromSeconds(kMinUpdateIntervalSeconds);
   else
     delta = desired_delta - update_delta;
 
   timer_.Start(FROM_HERE, delta, this, &GAIAInfoUpdateService::Update);
 }