DevTools: SASSSourceMapping hijacks the reverse sourcemapping for all UISourceCodes
DevTools: SASSSourceMapping hijacks the reverse sourcemapping for all UISourceCodes

This happens for ALL UISourceCodes when the SASS experiment is enabled

BUG=none
TBR=vsevik

Review URL: https://codereview.chromium.org/14619037

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@150411 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