Workaround for a bad type cast in BrowserAccessibilityManagerTest.TestMoveChildUp

BUG=235508
R=dmazzoni@chromium.org, siggi@chromium.org

Review URL: https://codereview.chromium.org/143693005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246640 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246640
Work around linux kernel bug by interpreting IPv6 "Preferred Lifetimes" of 0 as implying the address is deprecated.  This avoids spurious network changed signals on linux by ignoring more duplicate messages by canonicalizing them before matching them.

BUG=268042
TEST=net_unittests --gtest_filter=AddressTrackerLinuxTest.DeprecatedLifetime

Review URL: https://codereview.chromium.org/109213004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246641 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246641