Clear code cache on invalid cache data.
Clear code cache on invalid cache data.

R=vogelheim@chromium.org
BUG=chromium:399580

Review URL: https://codereview.chromium.org/749213002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185953 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs