Migrate Maps benchmark and integration test to wprgo.

Now that these tests are using the same archives, and Telemetry's
SeriallyExecutedBrowserTestCase supports wprgo, the switchover is
trivial.

BUG=756002

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I4495ad6c3bfde9d71ec9d5d3dde68867847fce4f
Reviewed-on: https://chromium-review.googlesource.com/629958
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496850}
4 files changed