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This is a reland of https://codereview.chromium.org/717193003/
which was reverted due to a SyzyASAN failure:
https://code.google.com/p/chromium/issues/detail?id=433357

I'm not quite sure how my patch caused the issue, but reverting it did fix it.
It seems that layout was being triggered during isKeyboardFocusable(), during
which the plugin element itself was destroyed.

This changes that path to only use an existing plugin to check for keyboard
focusability, similar to other code in HTMLPlugInElement.

TEST=fast/plugins/plugin/placeholder-focus.html
BUG=364716

Review URL: https://codereview.chromium.org/732783002

git-svn-id: svn://svn.chromium.org/blink/trunk@185468 bbb929c8-8fbe-4397-9dbb-9b2b20218538