Fix LayoutTest that broke on Chrome builds when media attribute logic was removed.

This change removes the "invalid media attribute" case from this test
so that it passes on release builds. This test was passing for the
wrong reasons on the Chromium waterfall because an error was being generated
for MP4 not being supported instead of the invalid attribute. The test
URL was changed to an Ogg file so that a supported media type will
be used on both the Chrome and Chromium builds.

BUG=338197
TESTS=LayoutTests/media/video-source-error-no-candidate.html

Review URL: https://codereview.chromium.org/334353003

git-svn-id: svn://svn.chromium.org/blink/trunk@176296 bbb929c8-8fbe-4397-9dbb-9b2b20218538