chore: don't use Object.assign

[jelbourn]

R: @kara

Object.assign isn't available in Google's TS builds.

[kara]

LGTM

[epelc]

@jelbourn What do you think about using polyfills for things like this instead? It would make transitioning over easier if/when google ever gets Object.assign.

[jelbourn]

@epelc In this case it was easier to add the function that try to tell Closure Compiler about Object.assign existing

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