Fix a few clang warnings.

It (rightfully) complains:
warning(clang): comparison of two values with different enumeration types ('blink::FontStretch' and 'SkFontStyle::Width') [-Wenum-compare]

No behavior change.

BUG=82385

Review URL: https://codereview.chromium.org/492613002

git-svn-id: svn://svn.chromium.org/blink/trunk@180664 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove Path2D runtime flag (status=stable)

BUG=402536

Review URL: https://codereview.chromium.org/483233002

git-svn-id: svn://svn.chromium.org/blink/trunk@180665 bbb929c8-8fbe-4397-9dbb-9b2b20218538