Removing PrefObserver usage, batch 4.

chrome/browser/extensions/component_loader.h

Index: chrome/browser/extensions/component_loader.h
diff --git a/chrome/browser/extensions/component_loader.h b/chrome/browser/extensions/component_loader.h
index beb2e6ba9e26698a016035c61c82210e9cac9e30..4904e1cb26477da5d9e4592f9ba82e1b78c3297b 100644
--- a/chrome/browser/extensions/component_loader.h
+++ b/chrome/browser/extensions/component_loader.h
@@ -11,7 +11,6 @@
 #include "base/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/prefs/public/pref_change_registrar.h"
-#include "base/prefs/public/pref_observer.h"
 #include "base/values.h"
 
 class ExtensionServiceInterface;
@@ -22,7 +21,7 @@ namespace extensions {
 class Extension;
 
 // For registering, loading, and unloading component extensions.
-class ComponentLoader : public PrefObserver {
+class ComponentLoader {
  public:
   ComponentLoader(ExtensionServiceInterface* extension_service,
                   PrefService* prefs,
@@ -69,10 +68,6 @@ class ComponentLoader : public PrefObserver {
   // Adds the default component extensions.
   void AddDefaultComponentExtensions();
 
-  // PrefObserver implementation
-  virtual void OnPreferenceChanged(PrefServiceBase* service,
-                                   const std::string& pref_name) OVERRIDE;
-
   static void RegisterUserPrefs(PrefService* prefs);
 
   // Parse the given JSON manifest. Returns NULL if it cannot be parsed, or if