Correct initial FrameView sizing in WebLocalFrameImpl
Correct initial FrameView sizing in WebLocalFrameImpl

WebLocalFrameImpl::CreateFrameView sets the inital FrameView size to be
the MainFrame's size, which is incorrect in the case of out-of-process
iframes. This patch corrects that problem.

BUG=419087

Review URL: https://codereview.chromium.org/919643003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@189985 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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