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Revert of PPAPI: Never re-enter JavaScript for PostMessage. (patchset #4 id:60001 of https://codereview.chromium.org/589213003/)

Reason for revert:
May be crashing Chrome:
https://code.google.com/p/chromium/issues/detail?id=417511

Original issue's description:
> PPAPI: Never re-enter JavaScript for PostMessage.
>
> Blocking renderer->plugin messages can be interrupted by any message
> from the plugin->renderer (even async ones). So while handline a blocking
> message, such as HandleInputEvent or HandleBlockingMessage, it's currently
> possible to re-enter JavaScript. This patch makes that impossible by
> queueing up Plugin->Renderer messages sent via PPB_Messaging::PostMessage
> while any renderer->plugin sync message is on the stack.
>
> BUG=384528
>
> Committed: https://crrev.com/f73075c99b5ba30e8d62dc5f13fdfb210d0fc506
> Cr-Commit-Position: refs/heads/master@{#296311}

TBR=raymes@chromium.org,dmichael@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=384528

Review URL: https://codereview.chromium.org/601923003

Cr-Commit-Position: refs/heads/master@{#296571}