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

chrome/browser/ui/cocoa/tabpose_window_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 "chrome/browser/ui/cocoa/tabpose_window.h"
 
 #include "base/mac/mac_util.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/cocoa/cocoa_profile_test.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/web_contents.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::SiteInstance;
 
 class TabposeWindowTest : public CocoaProfileTest {
  public:
   virtual void SetUp() {
     CocoaProfileTest::SetUp();
     ASSERT_TRUE(profile());
 
     site_instance_ = SiteInstance::Create(profile());
   }
 
   void AppendTabToStrip() {
     content::WebContents* web_contents = content::WebContents::Create(
-        content::WebContents::CreateParams(profile(), site_instance_));
+        content::WebContents::CreateParams(profile(), site_instance_.get()));
     browser()->tab_strip_model()->AppendWebContents(
         web_contents, /*foreground=*/true);
   }
 
   scoped_refptr<SiteInstance> site_instance_;
 };
 
 TEST_F(TabposeWindowTest, TestShow) {
   // Skip this test on 10.7
   // http://code.google.com/p/chromium/issues/detail?id=127845
@@ skipping 77 matching lines @@
   DCHECK_EQ([window selectedIndex], 0);
 
   [window selectTileAtIndexWithoutAnimation:1];
   model->CloseWebContentsAt(0, TabStripModel::CLOSE_NONE);
   DCHECK_EQ([window thumbnailLayerCount], 1u);
   DCHECK_EQ([window selectedIndex], 0);
 
   // Should release the window.
   [window mouseDown:nil];
 }