Remove ProfileHeader.maxJSObjectId from the protocol

Value of the propery is calculated based on the heap snapshot data and there is no need to pass it separately from the backend.

BUG=324769
R=alph@chromium.org

Review URL: https://codereview.chromium.org/137203013

git-svn-id: svn://svn.chromium.org/blink/trunk@165833 bbb929c8-8fbe-4397-9dbb-9b2b20218538