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

chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller_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/media_picker/desktop_media_picker_controller.h"
 
 #include "base/bind.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/media/webrtc/desktop_media_list_observer.h"
 #include "chrome/browser/media/webrtc/fake_desktop_media_list.h"
-#import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/ui/cocoa/media_picker/desktop_media_picker_item.h"
+#import "chrome/browser/ui/cocoa/test/cocoa_test_helper.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest_mac.h"
 
 using content::DesktopMediaID;
 
 @interface DesktopMediaPickerController (ExposedForTesting)
 - (IKImageBrowserView*)screenBrowser;
 - (IKImageBrowserView*)windowBrowser;
 - (NSTableView*)tabBrowser;
 - (NSSegmentedControl*)sourceTypeControl;
@@ skipping 393 matching lines @@
   screen_list_->SetSourceThumbnail(0);
   EXPECT_EQ(1U, [items count]);
   EXPECT_EQ(nil, [[items objectAtIndex:0] imageTitle]);
 
   AddScreen(1);
   screen_list_->SetSourceThumbnail(1);
   EXPECT_EQ(2U, [items count]);
   EXPECT_NE(nil, [[items objectAtIndex:0] imageTitle]);
   EXPECT_NE(nil, [[items objectAtIndex:1] imageTitle]);
 }