[Sync] All DTC's should check for NEEDS_CRYPTO and cryptogrpaher should be protected by transaction

BUG=76908,59242
TEST=tsan + all sync tests

Review URL: http://codereview.chromium.org/6729011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@79727 0039d316-1c4b-4281-b951-d872f2087c98
46 files changed