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"history.state === popStateEvent.state" should be evaluated to
true, however, the result changes depending on their evaluation
order.  See the bug for details.

This patch removes the custom bindings of PopStateEvent.state
and reimplements History.state and PopStateEvent.state in a
less hacky way, moving caching with V8 private property from
Blink-V8 bindings into Blink implementation.

WPT failures in this patch are expected.  I'll send a fix of
WPT separately.

Bug: 1070938
Change-Id: Iaf9bdbc6545cdbe18d8f3542944dfce61c443da1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147488Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759223}