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The docs is wrong: the callback that setContainerBehavior takes also
takes a bool indicating success (see [1]).

[1] https://cs.chromium.org/chromium/src/extensions/browser/api/virtual_keyboard_private/virtual_keyboard_private_api.cc?type=cs&g=0&l=135

Bug: 902232
Change-Id: Ieead5072d7ab13c2b1cac1a8042b143fdd01eebb
Reviewed-on: https://chromium-review.googlesource.com/c/1354738Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612466}