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Enables the new bindings of IDL callback functions and
IDL callback interfaces.

No behavioral change, but reduces the APK size by 7 KBytes.

Bug: 839389
Change-Id: I8281c922ac310a277954bf35864fc85c7bb9932b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370682
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816467}