Make the domain membership test only once per run.

This is not going to change while in session so why bother asking windows
again.

BUG=none
TEST=none
R=cpu@chromium.org

Review URL: https://codereview.chromium.org/145443009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253164 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253164
Rename Start/EndKeepAlive to Increment/DecrementKeepAliveCount

Keep alive is implemented as a reference count. This name makes it clear that a call to EndKeepAlive does not immediately end keep-alive, which came up in code review.

BUG=345918
TEST=compiles, no functional changes

Review URL: https://codereview.chromium.org/176363002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253165 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253165