Roll invalidation library deps to 51.
Roll invalidation library deps to 51.

This picks up the fix r51 which removes a bogus CHECK that was
causing a huge crash in Chrome:

r51:
 - Remove bogus check from registration manager.
 - Add unit test that two-stage session/client-id loss works correctly.

Also picked up is r50, some harmless cleanup.

BUG=60297
TEST=trybots, new unit test from upstream

Review URL: http://codereview.chromium.org/3977006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@63604 0039d316-1c4b-4281-b951-d872f2087c98

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