[Android WebView] Enable video tests

These should be working now.

BUG=238735
NOTRY=true

Review URL: https://codereview.chromium.org/133613003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245637 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245637