Remove NeedsRebaseline of a virtual test

Our rebaseline-o-matic script failed to handle it.

BUG=380472
TBR=wangxianzhu@chromium.org

Review URL: https://codereview.chromium.org/389393004

git-svn-id: svn://svn.chromium.org/blink/trunk@178081 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Constify metrics list references in SVGTextLayoutEngine

The text layout engine should not mutate the metrics list, so make the
various references to it const to clarify this a bit.

Review URL: https://codereview.chromium.org/390873002

git-svn-id: svn://svn.chromium.org/blink/trunk@178082 bbb929c8-8fbe-4397-9dbb-9b2b20218538