Remove PrefObserver usages, batch 10.

chrome/browser/ui/views/toolbar_view.cc

Index: chrome/browser/ui/views/toolbar_view.cc
diff --git a/chrome/browser/ui/views/toolbar_view.cc b/chrome/browser/ui/views/toolbar_view.cc
index 6e70d77f782764a10c637b5d8aa031f2595788c4..cdd336bc0ce3308264d3effb815a3470fb390f8d 100644
--- a/chrome/browser/ui/views/toolbar_view.cc
+++ b/chrome/browser/ui/views/toolbar_view.cc
@@ -287,7 +287,9 @@ void ToolbarView::Init() {
 
   location_bar_->Init();
   show_home_button_.Init(prefs::kShowHomeButton,
-                         browser_->profile()->GetPrefs(), this);
+                         browser_->profile()->GetPrefs(),
+                         base::Bind(&ToolbarView::OnShowHomeButtonChanged,
+                                    base::Unretained(this)));
 
   browser_actions_->Init();
 
@@ -558,14 +560,6 @@ void ToolbarView::Observe(int type,
   }
 }
 
-void ToolbarView::OnPreferenceChanged(PrefServiceBase* service,
-                                      const std::string& pref_name) {
-  if (pref_name == prefs::kShowHomeButton) {
-    Layout();
-    SchedulePaint();
-  }
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // ToolbarView, ui::AcceleratorProvider implementation:
 
@@ -910,3 +904,8 @@ void ToolbarView::UpdateAppMenuState() {
   app_menu_->SetPushedIcon(GetAppMenuIcon(views::CustomButton::STATE_PRESSED));
   SchedulePaint();
 }
+
+void ToolbarView::OnShowHomeButtonChanged() {
+  Layout();
+  SchedulePaint();
+}