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GREYConfiguration API has changed for EG2, so this CL uses different
methods depending on compiler defines. Also added a separate EG2 target
for ScopedSynchronizationDisabler.

Bug: 987646
Change-Id: I4005a8c12a149492642aeaa61bf6c7c5eabb7a82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1726370
Commit-Queue: Eugene But <eugenebut@chromium.org>
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683351}