Update OS X to use scoped_refptr<T>::get() rather than implicit "operator T*"

chrome/browser/ui/cocoa/extensions/extension_install_dialog_controller_browsertest.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/extensions/extension_install_dialog_controller.h"
 
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet_controller.h"
 #import "chrome/browser/ui/cocoa/extensions/extension_install_prompt_test_utils.h"
 #import "chrome/browser/ui/cocoa/extensions/extension_install_view_controller.h"
@@ skipping 12 matching lines @@
  protected:
   scoped_refptr<Extension> extension_;
 };
 
 IN_PROC_BROWSER_TEST_F(ExtensionInstallDialogControllerTest, BasicTest) {
   content::WebContents* tab = browser()->tab_strip_model()->GetWebContentsAt(0);
   ExtensionInstallPrompt::ShowParams show_params(tab);
 
   chrome::MockExtensionInstallPromptDelegate delegate;
   ExtensionInstallPrompt::Prompt prompt =
-      chrome::BuildExtensionInstallPrompt(extension_);
+      chrome::BuildExtensionInstallPrompt(extension_.get());
 
   ExtensionInstallDialogController* controller =
       new ExtensionInstallDialogController(show_params,
                                            &delegate,
                                            prompt);
 
   base::scoped_nsobject<NSWindow> window(
       [[[controller->view_controller() view] window] retain]);
   EXPECT_TRUE([window isVisible]);
 
   // Press cancel to close the window
   [[controller->view_controller() cancelButton] performClick:nil];
 
   // Wait for the window to finish closing.
   EXPECT_FALSE([window isVisible]);
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionInstallDialogControllerTest, Permissions) {
   content::WebContents* tab = browser()->tab_strip_model()->GetWebContentsAt(0);
   ExtensionInstallPrompt::ShowParams show_params(tab);
 
   chrome::MockExtensionInstallPromptDelegate delegate;
   ExtensionInstallPrompt::Prompt prompt =
-      chrome::BuildExtensionPostInstallPermissionsPrompt(extension_);
+      chrome::BuildExtensionPostInstallPermissionsPrompt(extension_.get());
 
   ExtensionInstallDialogController* controller =
       new ExtensionInstallDialogController(show_params,
                                            &delegate,
                                            prompt);
 
   base::scoped_nsobject<NSWindow> window(
       [[[controller->view_controller() view] window] retain]);
   EXPECT_TRUE([window isVisible]);
 
   // Press cancel to close the window
   [[controller->view_controller() cancelButton] performClick:nil];
 
   // Wait for the window to finish closing.
   EXPECT_FALSE([window isVisible]);
 }