Removed stray declared method.
Removed stray declared method.

Left-over from the removal of diffNeedsRecompositeLayer [1].

[1] https://codereview.chromium.org/360103008

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/565583002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@181801 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