Remove the last usages of PrefObserver outside of Prefs.

chrome/browser/ui/views/extensions/disabled_extensions_view.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/ui/views/extensions/disabled_extensions_view.h"
 
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 62 matching lines @@
 
   static bool done_showing_ui = false;
   if (done_showing_ui)
     return;  // Only show the bubble once per launch.
 
   // A pref that counts how often the bubble has been shown.
   IntegerPrefMember sideload_wipeout_bubble_shown;
 
   sideload_wipeout_bubble_shown.Init(
       prefs::kExtensionsSideloadWipeoutBubbleShown,
-          browser->profile()->GetPrefs(), NULL);
+          browser->profile()->GetPrefs());
   int bubble_shown_count = sideload_wipeout_bubble_shown.GetValue();
   if (bubble_shown_count >= kShowSideloadWipeoutBubbleMax)
     return;
   sideload_wipeout_bubble_shown.SetValue(++bubble_shown_count);
 
   // Fetch all disabled extensions.
   ExtensionService* extension_service =
       extensions::ExtensionSystem::Get(
           browser->profile())->extension_service();
   scoped_ptr<const ExtensionSet> wiped_out(
@@ skipping 29 matching lines @@
                            wiped_out->size());
 }
 
 DisabledExtensionsView::~DisabledExtensionsView() {
 }
 
 void DisabledExtensionsView::DismissBubble() {
   IntegerPrefMember sideload_wipeout_bubble_shown;
   sideload_wipeout_bubble_shown.Init(
       prefs::kExtensionsSideloadWipeoutBubbleShown,
-      browser_->profile()->GetPrefs(), NULL);
+      browser_->profile()->GetPrefs());
   sideload_wipeout_bubble_shown.SetValue(kShowSideloadWipeoutBubbleMax);
 
   GetWidget()->Close();
   content::RecordAction(
       UserMetricsAction("DisabledExtensionNotificationDismissed"));
 }
 
 void DisabledExtensionsView::ButtonPressed(views::Button* sender,
                                            const ui::Event& event) {
   if (sender == settings_button_) {
@@ skipping 169 matching lines @@
   layout->AddView(settings_button_);
   dismiss_button_ = new views::NativeTextButton(this,
       l10n_util::GetStringUTF16(IDS_OPTIONS_SIDELOAD_WIPEOUT_DISMISS));
   dismiss_button_->SetFont(
       dismiss_button_->font().DeriveFont(0, gfx::Font::BOLD));
   layout->AddView(dismiss_button_);
 
   content::RecordAction(
       UserMetricsAction("DisabledExtensionNotificationShown"));
 }