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Upcoming work for multiple operations, CRC calculation, etc... have made the lifetime of the SimpleEntryImpl more tricky. By adding ref counting, asynchronous operations are guaranteed access to the entry after execution.

R=pasko@chromium.org,felipeg@chromium.org,rvargas@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/13880016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194591 0039d316-1c4b-4281-b951-d872f2087c98