Improve unit testing of socket API (reland).

chrome/browser/extensions/test_extension_system.h

Index: chrome/browser/extensions/test_extension_system.h
diff --git a/chrome/browser/extensions/test_extension_system.h b/chrome/browser/extensions/test_extension_system.h
index d27f3b0eedb3e15a2301e108657ca6d73cec32e9..9864b1d52654261ef2e5c4b4e80efa08c95dd245 100644
--- a/chrome/browser/extensions/test_extension_system.h
+++ b/chrome/browser/extensions/test_extension_system.h
@@ -41,6 +41,8 @@ class TestExtensionSystem : public ExtensionSystem {
   // Creates an AlarmManager. Will be NULL otherwise.
   void CreateAlarmManager(base::Time (*now)());
 
+  void CreateSocketManager();
+
   virtual void Init(bool extensions_enabled) OVERRIDE {}
   void SetExtensionService(ExtensionService* service);
   virtual ExtensionService* extension_service() OVERRIDE;
@@ -76,6 +78,7 @@ class TestExtensionSystem : public ExtensionSystem {
   scoped_ptr<ExtensionProcessManager> extension_process_manager_;
   scoped_ptr<AlarmManager> alarm_manager_;
   scoped_refptr<ExtensionInfoMap> info_map_;
+  scoped_ptr<ApiResourceManager<Socket> > socket_manager_;
 };
 
 }  // namespace extensions