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

chrome/browser/ui/cocoa/autofill/autofill_pop_up_button_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/autofill/autofill_pop_up_button.h"
 
 #import "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"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 class AutofillPopUpButtonTest : public CocoaTest {
  public:
   AutofillPopUpButtonTest() {
     NSRect frame = NSMakeRect(0, 0, 50, 30);
     button_.reset([[AutofillPopUpButton alloc] initWithFrame:frame]);
     [button_ sizeToFit];
     [[test_window() contentView] addSubview:button_];
   }
 
  protected:
   base::scoped_nsobject<AutofillPopUpButton> button_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillPopUpButtonTest);
 };
 
 TEST_VIEW(AutofillPopUpButtonTest, button_)
 
 // Test invalid, mostly to ensure nothing leaks or crashes.
 TEST_F(AutofillPopUpButtonTest, DisplayWithInvalid) {
   [button_ setValidityMessage:nil];
   [button_ display];
   [button_ setValidityMessage:@"Something is rotten in the state of Denmark"];
   [button_ display];
 }