[DevTools] Move extension embedder message to InspectorFrontentAPI.

BUG=none

Review URL: https://codereview.chromium.org/712403002

git-svn-id: svn://svn.chromium.org/blink/trunk@185206 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: [regression] blue selection is truncated in Elements panel / non-wrap mode.

BUG=432502
NOTRY=true

Review URL: https://codereview.chromium.org/717163002

git-svn-id: svn://svn.chromium.org/blink/trunk@185207 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: move front-end files from components to ui.

Review URL: https://codereview.chromium.org/714423005

git-svn-id: svn://svn.chromium.org/blink/trunk@185209 bbb929c8-8fbe-4397-9dbb-9b2b20218538