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

chrome/browser/ui/cocoa/omnibox/omnibox_popup_separator_view_unittest.mm

 // Copyright 2013 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/omnibox/omnibox_popup_separator_view.h"
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
-#import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
+#import "chrome/browser/ui/cocoa/test/cocoa_test_helper.h"
 
 class OmniboxPopupBottomSeparatorViewTest : public CocoaTest {
  public:
   OmniboxPopupBottomSeparatorViewTest() {
     NSView* contentView = [test_window() contentView];
     bottom_view_.reset([[OmniboxPopupBottomSeparatorView alloc]
         initWithFrame:[contentView bounds]]);
     [contentView addSubview:bottom_view_];
   }
 
@@ skipping 24 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(OmniboxPopupTopSeparatorViewTest);
 };
 
 TEST_VIEW(OmniboxPopupTopSeparatorViewTest, top_view_);
 
 TEST_F(OmniboxPopupTopSeparatorViewTest, PreferredHeight) {
   EXPECT_LT(0, [OmniboxPopupTopSeparatorView preferredHeight]);
 }