Create c/b/ui/cocoa/test and move test files to there

chrome/browser/ui/cocoa/download/download_item_cell_unittest.mm

 // Copyright (c) 2011 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/download/download_item_cell.h"
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
 #include "chrome/browser/download/download_item_model.h"
-#import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
+#import "chrome/browser/ui/cocoa/test/cocoa_test_helper.h"
 #include "content/public/test/mock_download_item.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 using ::testing::_;
 using ::testing::Return;
 using ::testing::ReturnRefOfCopy;
 
 class DownloadItemCellTest : public CocoaTest {
  public:
@@ skipping 53 matching lines @@
   [button_ lockFocus];
   [cell_ drawWithFrame:[button_ bounds]
                 inView:button_];
   [button_ unlockFocus];
 
   // Unset indeterminate state.
   ON_CALL(item, PercentComplete()).WillByDefault(Return(0));
   [cell_ setStateFromDownload:&model];
   EXPECT_FALSE([cell_ indeterminateProgressTimer]);
 }