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

chrome/browser/ui/browser_close_browsertest.cc

Index: chrome/browser/ui/browser_close_browsertest.cc
===================================================================
--- chrome/browser/ui/browser_close_browsertest.cc	(revision 149002)
+++ chrome/browser/ui/browser_close_browsertest.cc	(working copy)
@@ -323,7 +323,7 @@
       if (!result)
         return false;
     }
-    ui_test_utils::RunAllPendingInMessageLoop();
+    content::RunAllPendingInMessageLoop();
 
     // All that work, for this one little test.
     EXPECT_TRUE((check_case.window_to_probe ==
@@ -365,7 +365,7 @@
         (*bit)->window()->Close();
       }
     }
-    ui_test_utils::RunAllPendingInMessageLoop();
+    content::RunAllPendingInMessageLoop();
 
     return true;
   }