Revert 273982 "Refactor external_install_ui"

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
===================================================================
--- chrome/browser/extensions/extension_service.h	(revision 274054)
+++ chrome/browser/extensions/extension_service.h	(working copy)
@@ -52,7 +52,6 @@
 class ExtensionSystem;
 class ExtensionUpdater;
 class OneShotEvent;
-class ExternalInstallManager;
 class SharedModuleService;
 class UpdateObserver;
 }  // namespace extensions
@@ -388,10 +387,6 @@
     return shared_module_service_.get();
   }
 
-  extensions::ExternalInstallManager* external_install_manager() {
-    return external_install_manager_.get();
-  }
-
   //////////////////////////////////////////////////////////////////////////////
   // For Testing
 
@@ -681,10 +676,6 @@
   // extensions.
   scoped_ptr<extensions::ExtensionErrorController> error_controller_;
 
-  // The manager for extensions that were externally installed that is
-  // responsible for prompting the user about suspicious extensions.
-  scoped_ptr<extensions::ExternalInstallManager> external_install_manager_;
-
   // Sequenced task runner for extension related file operations.
   scoped_refptr<base::SequencedTaskRunner> file_task_runner_;