DevTools: [CSS] remove getAllStylesheets method from protocol

This patch removes getAllStylesheets method from protocol. Instead,
clients should track styleSheetAdded/styleSheetRemoved events to
maintain actual stylesheet set.

BUG=

Review URL: https://codereview.chromium.org/148523012

git-svn-id: svn://svn.chromium.org/blink/trunk@166228 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: [CSS] remove getSupportedCSSProperties from protocol.json

This patch removes getSupportedCSSProperties from protocol.json and
substitutes it with build-time generated list of properties.

BUG=

Review URL: https://codereview.chromium.org/149653002

git-svn-id: svn://svn.chromium.org/blink/trunk@166229 bbb929c8-8fbe-4397-9dbb-9b2b20218538