Fix problem with Polyfills

[elorzafe]

Issue #, if available:
N/A
Description of changes:
Error on Polyfills on web browser

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[nidsharm]

👍

[codecov-io]

Codecov Report

Merging #636 into master will decrease coverage by 0.02%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #636      +/-   ##
==========================================
- Coverage   89.18%   89.15%   -0.03%     
==========================================
  Files          69       69              
  Lines        3217     3219       +2     
  Branches      611      611              
==========================================
+ Hits         2869     2870       +1     
- Misses        330      331       +1     
  Partials       18       18

Impacted Files	Coverage Δ
...ages/aws-amplify/src/Common/Polyfills/Polyfills.ts	80% <75%> (-20%)	⬇️

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[github-actions]

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