Update polymer to 1.11.3
Update polymer to 1.11.3

* https://github.com/Polymer/polymer/releases/tag/v1.11.3

* https://github.com/Polymer/polymer/releases/tag/v1.11.2

* https://github.com/Polymer/polymer/releases/tag/v1.11.1

Fixes we want are fixes for a memory leak.

Change-Id: Id3f9365647a882da26c7b188e51f47b142abf0bb

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