Enforcing that document.register requires the extends param for SVG elements.

The spec states that document.register must throw an exception if the prototype is an SVG element but this is not currently enforced.

BUG=323069

Review URL: https://codereview.chromium.org/108113003

git-svn-id: svn://svn.chromium.org/blink/trunk@163753 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Temporarily add ImageOnlyFailure for fast/css/font-face-woff2.html

We are going to switch the compression algorithm of WOFF 2.0 from LZMA to
Brotli. Currently fast/css/font-face-woff2.html tests a LZMA-compressed
woff2 font, so switching third_party/ots to Brotli would break the test.
Once we switched to Brotli, we will remove this expectation and update
the test font.

BUG=307828

Review URL: https://codereview.chromium.org/109093004

git-svn-id: svn://svn.chromium.org/blink/trunk@163754 bbb929c8-8fbe-4397-9dbb-9b2b20218538