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https://html.spec.whatwg.org/multipage/dom.html#html-element-constructors
> 7. Let prototype be Get(NewTarget, "prototype"). Rethrow any exceptions.

As the specification says, we should rethrow. Removing a v8::TryCatch
instance in V8HTMLConstructor::HtmlConstructor() works as "rethrow".

Bug: 854887
Change-Id: I6b2d6ae829453270fe4437a87e65528525c64990
Reviewed-on: https://chromium-review.googlesource.com/1124129Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572167}