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 - Fix newly found JSC_HIDDEN_INTERFACE_PROPERTY_MISMATCH, as a result of
   the interface checking overhaul at [1]
 - Fix/suppress newly found JSC_CONSTANT_PROPERTY_REASSIGNED_VALUE errors.

This is in preparation of rolling a newer compiler version at a later CL.

[1] https://github.com/google/closure-compiler/commit/86acbd5e3ec78f08a1804df5f1efbea129d29c0e

Bug: 1012840
Change-Id: I8c356c9d2d3df03120f04614eafa555de488c8fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850312
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704889}