make new syncer thread the default.

chrome/browser/sync/glue/sync_backend_host_mock.cc

Index: chrome/browser/sync/glue/sync_backend_host_mock.cc
diff --git a/chrome/browser/sync/glue/sync_backend_host_mock.cc b/chrome/browser/sync/glue/sync_backend_host_mock.cc
index 2d618f7281efde9597c591942c18e883fffba81f..8e16905dabacc6a5bf4784598ad896534b617623 100644
--- a/chrome/browser/sync/glue/sync_backend_host_mock.cc
+++ b/chrome/browser/sync/glue/sync_backend_host_mock.cc
@@ -12,15 +12,6 @@ ACTION(InvokeTask) {
 }
 
 SyncBackendHostMock::SyncBackendHostMock() {
-  // By default, the RequestPause and RequestResume methods will
-  // send the confirmation notification and return true.
-  ON_CALL(*this, RequestPause()).
-      WillByDefault(testing::DoAll(Notify(NotificationType::SYNC_PAUSED),
-                                   testing::Return(true)));
-  ON_CALL(*this, RequestResume()).
-      WillByDefault(testing::DoAll(Notify(NotificationType::SYNC_RESUMED),
-                                   testing::Return(true)));
-
   // By default, invoke the ready callback.
   ON_CALL(*this, ConfigureDataTypes(testing::_, testing::_, testing::_)).
       WillByDefault(InvokeTask());