DevTools: remove padding before pseudo-element matched styles.

After the "Toggle Element State" buttons moved away from Styles Sidebar
Pane layout, we no longer need the padding.

R=pfeldman

Review URL: https://codereview.chromium.org/1351413002

git-svn-id: svn://svn.chromium.org/blink/trunk@202600 bbb929c8-8fbe-4397-9dbb-9b2b20218538
2 files changed