Chrome_Win: Renderer Crash - WebCore::FrameView::setFrameRect
Chrome_Win: Renderer Crash - WebCore::FrameView::setFrameRect

This crash is caused by r166295
ismainframe check needs to be added before using the page

BUG=340580

Review URL: https://codereview.chromium.org/151363003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@166431 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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