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

chrome/browser/chromeos/process_proxy/process_proxy_browsertest.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 <gtest/gtest.h>
 
 #include <string>
 #include <sys/wait.h>
 
 #include "base/bind.h"
@@ skipping 197 matching lines @@
                                      MessageLoop::QuitClosure());
   }
 
   void RunTest() {
     BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
          base::Bind(&ProcessProxyTest::InitRegistryTest,
                     base::Unretained(this)));
 
     // Wait until all data from output watcher is received (QuitTask will be
     // fired on watcher thread).
-    ui_test_utils::RunMessageLoop();
+    content::RunMessageLoop();
 
     BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
          base::Bind(&ProcessProxyTest::EndRegistryTest,
                     base::Unretained(this)));
 
     // Wait until we clean up the process proxy.
-    ui_test_utils::RunMessageLoop();
+    content::RunMessageLoop();
   }
 
   scoped_ptr<TestRunner> test_runner_;
 
  private:
   ProcessProxyRegistry* registry_;
   pid_t pid_;
 };
 
 // Test will open new process that will run cat command, and verify data we
 // write to process gets echoed back.
 IN_PROC_BROWSER_TEST_F(ProcessProxyTest, RegistryTest) {
   test_runner_.reset(new RegistryTestRunner());
   RunTest();
 }
 
 // Open new process, then kill it. Verifiy that we detect when the process dies.
 IN_PROC_BROWSER_TEST_F(ProcessProxyTest, RegistryNotifiedOnProcessExit) {
   test_runner_.reset(new RegistryNotifiedOnProcessExitTestRunner());
   RunTest();
 }
 
 // Test verifies that \003 message send to process is processed as SigInt.
 // Timing out on the waterfall: http://crbug.com/115064
 IN_PROC_BROWSER_TEST_F(ProcessProxyTest, DISABLED_SigInt) {
   test_runner_.reset(new SigIntTestRunner());
   RunTest();
 }