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Need to override |_forwardHostPropV2| method for Polymer 2. |_forwardParentProp|
and |_forwardParentPath| can be removed after Polymer 2 migration is done.

Bug: 849788
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ic77854582a5184fa41fe5dca02724c9f2cc7dc7d
Reviewed-on: https://chromium-review.googlesource.com/1091653Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565470}