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

chrome/browser/ui/cocoa/extensions/extension_install_view_controller_unittest.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 <Cocoa/Cocoa.h>
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #import "chrome/browser/extensions/extension_install_prompt.h"
@@ skipping 233 matching lines @@
   EXPECT_TRUE([controller outlineView]);
   EXPECT_TRUE([[[controller outlineView] enclosingScrollView] isHidden]);
   EXPECT_TRUE([controller warningsSeparator]);
   EXPECT_TRUE([[controller warningsSeparator] isHidden]);
 }
 
 TEST_F(ExtensionInstallViewControllerTest, OAuthIssues) {
   chrome::MockExtensionInstallPromptDelegate delegate;
 
   ExtensionInstallPrompt::Prompt prompt =
-      chrome::BuildExtensionInstallPrompt(extension_);
+      chrome::BuildExtensionInstallPrompt(extension_.get());
   std::vector<string16> permissions;
   permissions.push_back(UTF8ToUTF16("warning 1"));
   prompt.SetPermissions(permissions);
   IssueAdviceInfoEntry issue;
   issue.description = UTF8ToUTF16("issue description 1");
   issue.details.push_back(UTF8ToUTF16("issue detail 1"));
   IssueAdviceInfo issues;
   issues.push_back(issue);
   prompt.SetOAuthIssueAdvice(issues);
 
@@ skipping 27 matching lines @@
                                                          prompt:prompt]);
 
   [controller view];  // Force nib load.
 
   EXPECT_TRUE([controller cancelButton]);
   EXPECT_FALSE([controller okButton]);
 
   [controller cancel:nil];
   EXPECT_EQ(1, delegate.abort_count());
 }