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

chrome/browser/ui/cocoa/styled_text_field_test_helper.h

Index: chrome/browser/ui/cocoa/styled_text_field_test_helper.h
diff --git a/chrome/browser/ui/cocoa/styled_text_field_test_helper.h b/chrome/browser/ui/cocoa/styled_text_field_test_helper.h
deleted file mode 100644
index 8ece57240ec85353a07227c45f69f61fa2239af3..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/cocoa/styled_text_field_test_helper.h
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) 2009 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 "chrome/browser/ui/cocoa/styled_text_field_cell.h"
-
-// Subclass of StyledTextFieldCell that allows you to slice off sections on the
-// left and right of the cell.
-@interface StyledTextFieldTestCell : StyledTextFieldCell {
-  CGFloat leftMargin_;
-  CGFloat rightMargin_;
-}
-@property(nonatomic, assign) CGFloat leftMargin;
-@property(nonatomic, assign) CGFloat rightMargin;
-@end