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

chrome/browser/chromeos/login/ownership_service.cc

Index: chrome/browser/chromeos/login/ownership_service.cc
diff --git a/chrome/browser/chromeos/login/ownership_service.cc b/chrome/browser/chromeos/login/ownership_service.cc
index c256e967a3bbe2a390c3c15cbf2906e84ecf6d0e..56288a2f2cd4b87922e4d4211fa91e61e0ac2b87 100644
--- a/chrome/browser/chromeos/login/ownership_service.cc
+++ b/chrome/browser/chromeos/login/ownership_service.cc
@@ -7,6 +7,7 @@
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/lazy_instance.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/browser/browser_thread.h"
 
 namespace chromeos {
@@ -28,6 +29,9 @@ OwnershipService::~OwnershipService() {}
 
 
 bool OwnershipService::IsAlreadyOwned() {
+  // This should not do blocking IO from the UI thread.
+  // Temporarily allow it for now. http://crbug.com/70097
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   return file_util::PathExists(utils_->GetOwnerKeyFilePath());
 }