Revert r160130 "DevTools: Show displayName in frame call stack and popovers for functions."

Breaks Win layout tests: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20Blink&showExpectations=true&tests=inspector%2Fdebugger%2Ffunction-display-name-call-stack.html

TBR=aandrey
BUG=

Review URL: https://codereview.chromium.org/34463002

git-svn-id: svn://svn.chromium.org/blink/trunk@160139 bbb929c8-8fbe-4397-9dbb-9b2b20218538