Reset "start profiling" button state after current profile has been removed

When profile being recorded is removed state of the record button in the launcher view and in the status bar is reset to default ("Start").

BUG=330692
R=alph@chromium.org

Review URL: https://codereview.chromium.org/131533002

git-svn-id: svn://svn.chromium.org/blink/trunk@164767 bbb929c8-8fbe-4397-9dbb-9b2b20218538