Rename profiler events to consoleProfile{Started,Finished}

consoleProfile -> consoleProfileStarted
addProfileHeader -> consoleProfileFinished
These names better reflect semantics of the events.

BUG=327298
R=alph@chromium.org

Review URL: https://codereview.chromium.org/110533006

git-svn-id: svn://svn.chromium.org/blink/trunk@164010 bbb929c8-8fbe-4397-9dbb-9b2b20218538