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The new bindings of IDL callbacks take the new IDL enumeration
instead of WTFString.  This patch adds adapter code so that
the callers of IDL callbacks work with both of the old and new
bindings.

Bug: 839389
Change-Id: Ia8b60105347f9e64d7e99ddbca831c22eec8d223
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434104
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811138}