Convert ConditionalCacheDeletionHelperBrowserTest to not depend on URLRequestContext when network service is enabled.

Reland after the revert by disabling the test when network service is enabled.

TBR=cudvall@chromium.org

Bug: 837753
Change-Id: I2f96b37fa9f2773799a6f9e23df9196d0abc74fe
Reviewed-on: https://chromium-review.googlesource.com/c/1358968
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613138}
1 file changed