chromeos: Update version of libcros to ccea53b3.
chromeos: Update version of libcros to ccea53b3.

This pulls in a new version needed by
http://codereview.chromium.org/6658023/.

BUG=chromium-os:12645
TEST=built and ran it to check that current chrome works with updated libcros
TBR=davemoore

Review URL: http://codereview.chromium.org/6679017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@77907 0039d316-1c4b-4281-b951-d872f2087c98

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