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The PluginView method layoutIfNeeded causes WebView plugins to update
their entire lifecycle, but we only call that if their layout is
dirtied. In the presence of some style changes, they can need
invalidation or compositing updates without layout, and our recursive
lifecycle update missed WebView plugins as it only recurses through
the Frame tree.

This change always updates child plugins when
FrameView::updateStyleAndLayoutIfNeededRecursive is called.

BUG=545039

Review URL: https://codereview.chromium.org/1708923002

Cr-Commit-Position: refs/heads/master@{#376114}