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79455270b2
We need the key to be a String even though we claimed we could support any Object. Also, clean up some style nits including shortening the |root| getters on OneChildRenderNodeWrappers. Fixes https://github.com/domokit/sky_sdk/issues/26. TBR=ianh@google.com Review URL: https://codereview.chromium.org/1173293005.