Sync Oilpan test expectations.
Sync Oilpan test expectations.

Remove expectations that no longer applies or is subsumed by
TestExpectations (compositing/iframes/scrolling-iframe.html)

TBR=oilpan-reviews
BUG=345655
NOTRY=true

Review URL: https://codereview.chromium.org/971333002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191188 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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