Rename PromisesPanel to PromisePane.

BUG=348919

Review URL: https://codereview.chromium.org/603623002

git-svn-id: svn://svn.chromium.org/blink/trunk@184365 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: NetworkPanel: show link where resource timing is explained.

BUG=403508

Review URL: https://codereview.chromium.org/659573005

git-svn-id: svn://svn.chromium.org/blink/trunk@184369 bbb929c8-8fbe-4397-9dbb-9b2b20218538