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

chrome/browser/extensions/api/page_capture/page_capture_apitest.cc

Index: chrome/browser/extensions/api/page_capture/page_capture_apitest.cc
===================================================================
--- chrome/browser/extensions/api/page_capture/page_capture_apitest.cc	(revision 149002)
+++ chrome/browser/extensions/api/page_capture/page_capture_apitest.cc	(working copy)
@@ -58,7 +58,7 @@
   ASSERT_TRUE(RunExtensionTest("page_capture")) << message_;
   ASSERT_FALSE(delegate.temp_file_.empty());
   // Flush the message loops to make sure the delete happens.
-  ui_test_utils::RunAllPendingInMessageLoop(content::BrowserThread::FILE);
-  ui_test_utils::RunAllPendingInMessageLoop(content::BrowserThread::IO);
+  content::RunAllPendingInMessageLoop(content::BrowserThread::FILE);
+  content::RunAllPendingInMessageLoop(content::BrowserThread::IO);
   ASSERT_FALSE(file_util::PathExists(delegate.temp_file_));
 }