Revert r48393002 "DevTools: Use docking mode button to control Screencast visibility and docking state" Breaks docking modes, screencast.

git-svn-id: svn://svn.chromium.org/blink/trunk@161225 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Revert r161163"[DevTools] Tuned protocol to simplify devtools_protocol_constants generation."

This breaks screencast.

git-svn-id: svn://svn.chromium.org/blink/trunk@161226 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Revert r161032 "DevTools: Update status bar button icons."

This kills screencast button that is used.

git-svn-id: svn://svn.chromium.org/blink/trunk@161227 bbb929c8-8fbe-4397-9dbb-9b2b20218538