Support non square pixel aspect ratio in the Mp2t stream parser.

BUG=254214

Review URL: https://codereview.chromium.org/104833003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239350 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239350
Do not default secure networks to shared during reconfiguration.

Default to their current sharing status, if set.

TEST=see bug

BUG=326717

Review URL: https://codereview.chromium.org/109083002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239351 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239351