Remove PrefObserver usage, batch 9.

chrome/browser/net/http_server_properties_manager.h

Index: chrome/browser/net/http_server_properties_manager.h
diff --git a/chrome/browser/net/http_server_properties_manager.h b/chrome/browser/net/http_server_properties_manager.h
index 07e34ba7080513b26a0e57699999df4a8d495a8f..d71813e0971a698111b93a287528af05edd97648 100644
--- a/chrome/browser/net/http_server_properties_manager.h
+++ b/chrome/browser/net/http_server_properties_manager.h
@@ -12,7 +12,6 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/prefs/public/pref_change_registrar.h"
-#include "base/prefs/public/pref_observer.h"
 #include "base/timer.h"
 #include "base/values.h"
 #include "net/base/host_port_pair.h"
@@ -47,8 +46,7 @@ namespace chrome_browser_net {
 // posted to IO from that method on UI. This is used to go through IO before
 // the actual update starts, and grab a WeakPtr.
 class HttpServerPropertiesManager
-    : public net::HttpServerProperties,
-      public PrefObserver {
+    : public net::HttpServerProperties {
  public:
   // Create an instance of the HttpServerPropertiesManager. The lifetime of the
   // PrefService objects must be longer than that of the
@@ -194,9 +192,7 @@ class HttpServerPropertiesManager
       const base::Closure& completion);
 
  private:
-  // Callback for preference changes.
-  virtual void OnPreferenceChanged(PrefServiceBase* service,
-                                   const std::string& pref_name) OVERRIDE;
+  void OnHttpServerPropertiesChanged();
 
   // ---------
   // UI thread