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

chrome/browser/ui/cocoa/passwords/autosignin_prompt_view_controller_unittest.mm

 // Copyright 2016 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/passwords/account_chooser_view_controller.h"
 
 #include <Carbon/Carbon.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/utf_string_conversions.h"
-#import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/ui/cocoa/passwords/autosignin_prompt_view_controller.h"
+#import "chrome/browser/ui/cocoa/test/cocoa_test_helper.h"
 #include "chrome/browser/ui/passwords/password_dialog_controller_mock.h"
 #include "components/autofill/core/common/password_form.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "ui/events/test/cocoa_test_event_utils.h"
 
 
 namespace {
 
 constexpr char kDialogTitle[] = "Auto signin";
@@ skipping 84 matching lines @@
 
 TEST_F(AutoSigninPromptViewControllerTest, CloseOnEsc) {
   SetUpAutosigninFirstRun();
   EXPECT_CALL(*this, OnPerformClose());
   [[view_controller() view]
       performKeyEquivalent:cocoa_test_event_utils::KeyEventWithKeyCode(
                                kVK_Escape, '\e', NSKeyDown, 0)];
 }
 
 }  // namespace