[goog.object] Make unsafeClone a template T->T.
[goog.object] Make unsafeClone a template T->T.

Since cloning is supposed to return an equal object, I think the type signature should reflect that, otherwise every use of unsafeClone needs a cast.

RELNOTES[INC]: goog.object.unsafeClone has a T->T signature instead of *->*

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129981481

joeltine/closure-library,ikabirov/closure-library,joeltine/closure-library,lucidsoftware/closure-library,codyebberson/closure-library,platinumpixs/google-closure-library,lucidsoftware/closure-library,lucidsoftware/closure-library,Medium/closure-library,lucidsoftware/closure-library,codyebberson/closure-library,ChadKillingsworth/closure-library,Medium/closure-library,teppeis/closure-library,Medium/closure-library,ikabirov/closure-library,google/closure-library,redforks/closure-library,codyebberson/closure-library,ChadKillingsworth/closure-library,ikabirov/closure-library,platinumpixs/google-closure-library,ikabirov/closure-library,google/closure-library,ChadKillingsworth/closure-library,google/closure-library,joeltine/closure-library,redforks/closure-library,ChadKillingsworth/closure-library,google/closure-library,teppeis/closure-library,redforks/closure-library,Medium/closure-library,joeltine/closure-library,google/closure-library,codyebberson/closure-library,platinumpixs/google-closure-library,teppeis/closure-library,teppeis/closure-library,redforks/closure-library,platinumpixs/google-closure-library