Move RunAllPendingInMessageLoop from ui_test_utils.h to test_utils.h, so that it can be reused by c…

chrome/browser/ui/tab_modal_confirm_dialog_browsertest.cc

Index: chrome/browser/ui/tab_modal_confirm_dialog_browsertest.cc
===================================================================
--- chrome/browser/ui/tab_modal_confirm_dialog_browsertest.cc	(revision 149002)
+++ chrome/browser/ui/tab_modal_confirm_dialog_browsertest.cc	(working copy)
@@ -43,11 +43,11 @@
       chrome::GetActiveWebContents(browser()));
   dialog_ = CreateTestDialog(delegate_,
                              chrome::GetActiveTabContents(browser()));
-  ui_test_utils::RunAllPendingInMessageLoop();
+  content::RunAllPendingInMessageLoop();
 }
 
 void TabModalConfirmDialogTest::CleanUpOnMainThread() {
-  ui_test_utils::RunAllPendingInMessageLoop();
+  content::RunAllPendingInMessageLoop();
   ::testing::Mock::VerifyAndClearExpectations(delegate_);
 }