Experimental workaround for CHECK in NetworkChangeNotifierWin.
Also adds a related UMA histogram.

BUG=69198
TEST=NetworkChangeNotifierWinTest.*, UMA metrics

Review URL: http://codereview.chromium.org/7886036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@104120 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed