Add more using base::Time* to http_cache_transaction.cc.
Add more using base::Time* to http_cache_transaction.cc.

While working on http://codereview.chromium.org/10808047/ I found we should either use all three basic time types, or none of them. Here's a CL to use all of them. Splitting this out makes the main HttpCache histogram CL more readable by not having these distracting changes.

R=rvargas@chromium.org
BUG=None


Review URL: https://chromiumcodereview.appspot.com/10797042

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@147746 0039d316-1c4b-4281-b951-d872f2087c98

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