The link should be activated by enter key on focusing the child element inside the anchor.
The handing of Enter key has moved from keydown to keypress in anchor element.
And this makes behavior consistent with Firefox and IE.

BUG=350738, 425859
R=pdr@chromium.org
R=rob@robwu.nl
TEST=LayoutTests/fast/events/press-enter-key-on-focused-element-inside-link.html

Review URL: https://codereview.chromium.org/619613005

git-svn-id: svn://svn.chromium.org/blink/trunk@184783 bbb929c8-8fbe-4397-9dbb-9b2b20218538