Remove workaround for ancient Chrome bug.
Remove workaround for ancient Chrome bug.

The workaround causes Error objects to be rendered as "[object Object]".  We need the correct stack.

RELNOTES: n/a

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=183682982

google/closure-library,lucidsoftware/closure-library,lucidsoftware/closure-library,google/closure-library,teppeis/closure-library,teppeis/closure-library,lucidsoftware/closure-library,google/closure-library,teppeis/closure-library,google/closure-library,teppeis/closure-library,lucidsoftware/closure-library,google/closure-library