Move ui_test_utils::RunMessageLoop to test_utils so that it can be reused by content_browsertests.

chrome/test/base/ui_test_utils_mac.mm

 // Copyright (c) 2012 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.
 
 #include "chrome/test/base/ui_test_utils.h"
 
 #include <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 
 #include "base/bind.h"
@@ skipping 31 matching lines @@
 void ClickOnView(const Browser* browser, ViewID vid) {
   NSWindow* window = browser->window()->GetNativeWindow();
   DCHECK(window);
   NSView* view = view_id_util::GetView(window, vid);
   DCHECK(view);
   MoveMouseToCenterAndPress(
       view,
       ui_controls::LEFT,
       ui_controls::DOWN | ui_controls::UP,
       MessageLoop::QuitClosure());
-  RunMessageLoop();
+  content::RunMessageLoop();
 }
 
 void HideNativeWindow(gfx::NativeWindow window) {
   [window orderOut:nil];
 }
 
 bool ShowAndFocusNativeWindow(gfx::NativeWindow window) {
   // Make sure an unbundled program can get the input focus.
   ProcessSerialNumber psn = { 0, kCurrentProcess };
   TransformProcessType(&psn,kProcessTransformToForegroundApplication);
@@ skipping 21 matching lines @@
   center = [view convertPoint:center toView:nil];
   center = [window convertBaseToScreen:center];
   center = NSMakePoint(center.x, [screen frame].size.height - center.y);
 
   ui_controls::SendMouseMoveNotifyWhenDone(
       center.x, center.y,
       base::Bind(&internal::ClickTask, button, state, task));
 }
 
 }  // namespace ui_test_utils