Remove PrefObserver usages, batch 13.

chrome/browser/ui/webui/options/font_settings_handler.h

Index: chrome/browser/ui/webui/options/font_settings_handler.h
diff --git a/chrome/browser/ui/webui/options/font_settings_handler.h b/chrome/browser/ui/webui/options/font_settings_handler.h
index 1c6af163205aaec59f704977fa516a72ebef83cc..07c7fdc6c726de78c23d6d07217d434da5b079a7 100644
--- a/chrome/browser/ui/webui/options/font_settings_handler.h
+++ b/chrome/browser/ui/webui/options/font_settings_handler.h
@@ -6,7 +6,6 @@
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_FONT_SETTINGS_HANDLER_H_
 
 #include "base/memory/scoped_ptr.h"
-#include "base/prefs/public/pref_observer.h"
 #include "chrome/browser/api/prefs/pref_member.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 
@@ -17,8 +16,7 @@ class ListValue;
 namespace options {
 
 // Font settings overlay page UI handler.
-class FontSettingsHandler : public OptionsPageUIHandler,
-                            public PrefObserver {
+class FontSettingsHandler : public OptionsPageUIHandler {
  public:
   FontSettingsHandler();
   virtual ~FontSettingsHandler();
@@ -30,10 +28,6 @@ class FontSettingsHandler : public OptionsPageUIHandler,
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
-  // PrefObserver implementation.
-  virtual void OnPreferenceChanged(PrefServiceBase* service,
-                                   const std::string& pref_name) OVERRIDE;
-
  private:
   void HandleFetchFontsData(const ListValue* args);
 
@@ -44,6 +38,7 @@ class FontSettingsHandler : public OptionsPageUIHandler,
   void SetUpSansSerifFontSample();
   void SetUpFixedFontSample();
   void SetUpMinimumFontSample();
+  void OnWebKitDefaultFontSizeChanged();
 
   StringPrefMember standard_font_;
   StringPrefMember serif_font_;