Temporary whitelist several cases of disk I/O on the UI threads in cros.

chrome/browser/browser_main.cc

 // Copyright (c) 2011 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 "chrome/browser/browser_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 513 matching lines @@
   // and 1 if it can't be. This is for validation that the library is installed
   // and versioned properly for Chrome to find.
   if (command_line.HasSwitch(switches::kTestLoadLibcros))
     exit(!chromeos::CrosLibrary::Get()->EnsureLoaded());
 #endif
 }
 
 void RunUIMessageLoop(BrowserProcess* browser_process) {
   TRACE_EVENT_BEGIN("BrowserMain:MESSAGE_LOOP", 0, "");
 
-#if !defined(OS_CHROMEOS)
   // If the UI thread blocks, the whole UI is unresponsive.
   // Do not allow disk IO from the UI thread.
-  // TODO(evanm): turn this on for all platforms.
-  //   http://code.google.com/p/chromium/issues/detail?id=60211
   base::ThreadRestrictions::SetIOAllowed(false);
-#endif
 
 #if defined(TOOLKIT_VIEWS)
   views::AcceleratorHandler accelerator_handler;
   MessageLoopForUI::current()->Run(&accelerator_handler);
 #elif defined(USE_X11)
   MessageLoopForUI::current()->Run(NULL);
 #elif defined(OS_POSIX)
   MessageLoopForUI::current()->Run();
 #endif
 #if defined(OS_CHROMEOS)
@@ skipping 1198 matching lines @@
 #if defined(OS_CHROMEOS)
   // To be precise, logout (browser shutdown) is not yet done, but the
   // remaining work is negligible, hence we say LogoutDone here.
   chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutDone",
                                                         false);
   chromeos::BootTimesLoader::Get()->WriteLogoutTimes();
 #endif
   TRACE_EVENT_END("BrowserMain", 0, 0);
   return result_code;
 }