Ensure tests have an active task runner

chrome/browser/sync/profile_sync_service_factory_unittest.cc

Index: chrome/browser/sync/profile_sync_service_factory_unittest.cc
diff --git a/chrome/browser/sync/profile_sync_service_factory_unittest.cc b/chrome/browser/sync/profile_sync_service_factory_unittest.cc
index e3c2da1ae595c8578ec2bedce3cc2fd1bb7ab7cd..c1fb61b5c6b27b736bcf47ab0e443384271609b4 100644
--- a/chrome/browser/sync/profile_sync_service_factory_unittest.cc
+++ b/chrome/browser/sync/profile_sync_service_factory_unittest.cc
@@ -7,6 +7,7 @@
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/testing_profile.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class ProfileSyncServiceFactoryTest : public testing::Test {
@@ -17,6 +18,7 @@ class ProfileSyncServiceFactoryTest : public testing::Test {
     profile_.reset(new TestingProfile());
   }
 
+  content::TestBrowserThreadBundle thread_bundle_;
   scoped_ptr<Profile> profile_;
 };