[Mac] Organize some files into chrome/browser/ui/cocoa/tab_contents/....

chrome/browser/ui/cocoa/tab_contents/previewable_contents_controller_unittest.mm

 // Copyright (c) 2010 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/scoped_nsobject.h"
 #include "chrome/browser/ui/cocoa/browser_test_helper.h"
 #include "chrome/browser/ui/cocoa/cocoa_test_helper.h"
-#import "chrome/browser/ui/cocoa/previewable_contents_controller.h"
+#import "chrome/browser/ui/cocoa/tab_contents/previewable_contents_controller.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 namespace {
 
 class PreviewableContentsControllerTest : public CocoaTest {
  public:
   virtual void SetUp() {
     CocoaTest::SetUp();
     controller_.reset([[PreviewableContentsController alloc] init]);
     [[test_window() contentView] addSubview:[controller_ view]];
   }
 
   scoped_nsobject<PreviewableContentsController> controller_;
 };
 
 TEST_VIEW(PreviewableContentsControllerTest, [controller_ view])
 
 // TODO(rohitrao): Test showing and hiding the preview.  This may require
 // changing the interface to take in a TabContentsView* instead of a
 // TabContents*.
 
 }  // namespace