WebFrame::traceFrame methods must be accessible from OpenedFrameTracker at least on Oilpan build
WebFrame::traceFrame methods must be accessible from OpenedFrameTracker at least on Oilpan build

TBR=haraken,dcheng
NOTRY=True
BUG=None

Review URL: https://codereview.chromium.org/1418993005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#356492}

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