DevTools: Inject styleSheetId in WebInspector.CSSLocation constructor

Style sheet ID is required for the live location construction, and it is
always known at the point where CSSLocation instances are constructed.

R=vsevik

Review URL: https://codereview.chromium.org/404763002

git-svn-id: svn://svn.chromium.org/blink/trunk@178550 bbb929c8-8fbe-4397-9dbb-9b2b20218538