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Only works with logs created by the new "--log-net-log=file",
which writes NetLog events to the specified file, regardless
of other logging command line parameters.

Using "--log-net-log" without a file name will just write
NetLog events to VLOG(1), as before.

BUG=63687
TEST=None

Review URL: http://codereview.chromium.org/6025017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72567 0039d316-1c4b-4281-b951-d872f2087c98