Remove PrefObserver usage, batch 9.

chrome/browser/printing/cloud_print/cloud_print_proxy_service.h

Index: chrome/browser/printing/cloud_print/cloud_print_proxy_service.h
diff --git a/chrome/browser/printing/cloud_print/cloud_print_proxy_service.h b/chrome/browser/printing/cloud_print/cloud_print_proxy_service.h
index e12a942ce77ce87b231239ccf631eee2830440a4..8f5b4709f40c26e4cef4ccc6826226309757f6eb 100644
--- a/chrome/browser/printing/cloud_print/cloud_print_proxy_service.h
+++ b/chrome/browser/printing/cloud_print/cloud_print_proxy_service.h
@@ -13,7 +13,6 @@
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/prefs/public/pref_change_registrar.h"
-#include "base/prefs/public/pref_observer.h"
 #include "chrome/browser/printing/cloud_print/cloud_print_setup_handler.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 
@@ -28,8 +27,7 @@ struct CloudPrintProxyInfo;
 // running in the service process.
 class CloudPrintProxyService
     : public CloudPrintSetupHandlerDelegate,
-      public ProfileKeyedService,
-      public PrefObserver {
+      public ProfileKeyedService {
  public:
   explicit CloudPrintProxyService(Profile* profile);
   virtual ~CloudPrintProxyService();
@@ -63,10 +61,6 @@ class CloudPrintProxyService
   // CloudPrintSetupHandler::Delegate implementation.
   virtual void OnCloudPrintSetupClosed() OVERRIDE;
 
-  // PrefObserver implementation.
-  virtual void OnPreferenceChanged(PrefServiceBase* service,
-                                   const std::string& pref_name) OVERRIDE;
-
  private:
   // NotificationDelegate implementation for the token expired notification.
   class TokenExpiredNotificationDelegate;