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

chrome/browser/extensions/api/downloads/downloads_api_unittest.cc

 // 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 <algorithm>
 
 #include "base/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/message_loop.h"
@@ skipping 175 matching lines @@
   bool WaitFor(Profile* profile,
                const std::string& event_name,
                const std::string& json_args) {
     waiting_for_.reset(new Event(profile, event_name, json_args, base::Time()));
     for (std::deque<Event*>::const_iterator iter = events_.begin();
          iter != events_.end(); ++iter) {
       if ((*iter)->Equals(*waiting_for_.get()))
         return true;
     }
     waiting_ = true;
-    ui_test_utils::RunMessageLoop();
+    content::RunMessageLoop();
     bool success = !waiting_;
     if (waiting_) {
       // Print the events that were caught since the last WaitFor() call to help
       // find the erroneous event.
       // TODO(benjhayden) Fuzzy-match and highlight the erroneous event.
       for (std::deque<Event*>::const_iterator iter = events_.begin();
           iter != events_.end(); ++iter) {
         if ((*iter)->caught() > last_wait_) {
           LOG(INFO) << "Caught " << (*iter)->Debug();
         }
@@ skipping 1972 matching lines @@
                           "  \"state\": {"
                           "    \"previous\": \"in_progress\","
                           "    \"current\": \"complete\"}}]",
                           result_id,
                           GetFilename("on_record.txt.crdownload").c_str(),
                           GetFilename("on_record.txt").c_str())));
   std::string disk_data;
   EXPECT_TRUE(file_util::ReadFileToString(item->GetFullPath(), &disk_data));
   EXPECT_STREQ(kPayloadData, disk_data.c_str());
 }