Cronet: Convert options test to use base::Value

Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I559908461026784530214507380cda6289141cf6
Reviewed-on: https://chromium-review.googlesource.com/1015660
Commit-Queue: Julia Tuttle <[email protected]>
Reviewed-by: Andrei Kapishnikov <[email protected]>
Cr-Commit-Position: refs/heads/master@{#553579}
1 file changed