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This removes the last user of didLayoutWithPendingStylesheets() and instead moves
the call to dispatchDidFirstVisuallyNonEmptyLayout into WebViewImpl so the
notification to the embedder is tied to the pumping of frames. This changes the
behavior of this notification to only dispatch for the top level frame,
but Chromium already has a check for that:

https://chromium.googlesource.com/chromium/src/+/976d4d9a2735bdc11e5a641c84b6382566d48f1d/content/renderer/render_frame_impl.cc#3472

RenderFrameImpl::didFirstVisuallyNonEmptyLayout's first check is

if (frame->parent())
    return;

so we already ignore all frames that are not the main frame. Future patches will
clean up this interface so it's obvious this really only happens for the main
frame.

BUG=521692
R=dglazkov@chromium.org

Review URL: https://codereview.chromium.org/1295053002 .

git-svn-id: svn://svn.chromium.org/blink/trunk@200664 bbb929c8-8fbe-4397-9dbb-9b2b20218538