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This function is only called on tests, and it goes to effect tree to
get correct information. Remove this from LayerImpl.

R=danakj

Bug: 822873
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I21e13b32de44a5a5c50fbdc5029f2fe620a17e09
Reviewed-on: https://chromium-review.googlesource.com/967089Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543947}