unit_tests failure in Dr. Memory light mode

_From [zhao...@google.com](https://code.google.com/u/106321947286816917100/) on September 16, 2013 23:35:29_

http://build.chromium.org/p/chromium.memory.fyi/builders/Windows%20Unit%20%28DrMemory%29/builds/13352 SyncBackendHostTest.DownloadControlTypes:
[1784:4128:0915/201748:735631778:WARNING:sync_backend_registrar.cc(150)] No history worker -- removing TYPED_URLS
[1784:4128:0915/201748:735631778:WARNING:sync_backend_registrar.cc(154)] No password worker -- removing PASSWORDS
e:\b\build\slave\drm-cr\build\src\chrome\browser\sync\glue\sync_backend_host_unittest.cc(183): error: Actual function call count doesn't match EXPECT_CALL(mock_frontend_, OnBackendInitialized(_, _, expect_success))...
Expected: to be called once
Actual: never called - unsatisfied and active http://build.chromium.org/p/chromium.memory.fyi/builders/Windows%20Unit%20%28DrMemory%29/builds/13373 SyncBackendHostTest.SilentlyFailToDownloadControlTypes:
[8808:7960:0916/181452:814652633:WARNING:sync_backend_registrar.cc(150)] No history worker -- removing TYPED_URLS
[8808:7960:0916/181452:814652633:WARNING:sync_backend_registrar.cc(154)] No password worker -- removing PASSWORDS
[8808:7960:0916/181507:814667703:ERROR:sync_backend_host.cc(1239)] Failed to download control types
e:\b\build\slave\drm-cr\build\src\chrome\browser\sync\glue\sync_backend_host_unittest.cc(183): error: Actual function call count doesn't match EXPECT_CALL(mock_frontend_, OnBackendInitialized(_, _, expect_success))...
Expected: to be called once
Actual: never called - unsatisfied and active

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=1334_