Set '*' as OWNERS for Source/testing/

Currently, there is no OWNERS file for Source/testing/ and the fallback path is
to Source/. This change adds an OWNERS file for Source/testing/ with contents
'*', to match the OWNERS of LayoutTests/.

R=abarth

Review URL: https://chromiumcodereview.appspot.com/18287002

git-svn-id: svn://svn.chromium.org/blink/trunk@153312 bbb929c8-8fbe-4397-9dbb-9b2b20218538
gardening: marked 2 media/encrypted-media tests as crash after r209534

BUG=255971
TBR=esprehn

Review URL: https://codereview.chromium.org/18299002

git-svn-id: svn://svn.chromium.org/blink/trunk@153313 bbb929c8-8fbe-4397-9dbb-9b2b20218538