DevTools: DataGrid: fix "recalculateSiblings" method visibility.

BUG=316092

Review URL: https://codereview.chromium.org/428543002

git-svn-id: svn://svn.chromium.org/blink/trunk@179138 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[DevTools] Fix emulation drawer button styles.

BUG=398354
TBR=pfeldman

Review URL: https://codereview.chromium.org/421543003

git-svn-id: svn://svn.chromium.org/blink/trunk@179139 bbb929c8-8fbe-4397-9dbb-9b2b20218538