Remove WebMediaSourceNew declaration.

BUG=272993
TEST=All existing LayoutTests still pass.

Review URL: https://chromiumcodereview.appspot.com/23658043

git-svn-id: svn://svn.chromium.org/blink/trunk@157720 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add SubpixelFontScaling to RuntimeEnabledFeatures

Add a SubpixelFontScaling feature to RuntimeEnabledFeatures, when
enabled fonts are allowed to be sized with sub-css-pixel precision.

Note that this feature is not enabled for any configuration at the
moment.

BUG=290411
R=dglazkov@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23766033

git-svn-id: svn://svn.chromium.org/blink/trunk@157721 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Move path-arc-invalid.html into LayoutTests/svg/custom.

Review URL: https://chromiumcodereview.appspot.com/23872020

git-svn-id: svn://svn.chromium.org/blink/trunk@157722 bbb929c8-8fbe-4397-9dbb-9b2b20218538