DevTools: Extract and lazy-load the "console" module

WebInspector.consoleView accesses has been replace by dependency injection

R=pfeldman

Review URL: https://codereview.chromium.org/177153005

git-svn-id: svn://svn.chromium.org/blink/trunk@168738 bbb929c8-8fbe-4397-9dbb-9b2b20218538