Do not pass Profiler.start/stop commands through V8 debugger's command queue

DevToolsAgentFilter would put this commands into V8's command queue to make sure they are dispatched even if a script on the main thread is in a tight loop. This implementation implies that the debugger agent is enabled as otherwise v8 debugger's command queue has now handler. This patch removes Profiler.start/stop commands from the list of "interrupting" commands leaving only debugger commands on that list. I should note that Profiler.stop was already broken after r169260 as Profiler.stop response would not be sent to the front-end until current task is over.

BUG=260749
R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/239313014

git-svn-id: svn://svn.chromium.org/blink/trunk@171857 bbb929c8-8fbe-4397-9dbb-9b2b20218538