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This is supposedly a transient config until CAS support. So far only the staging builders need to override this (to dev host). This CL adds the property to goma and webrtc builders.

Bug: 894045, 1126307
Change-Id: I7cff2541d919fc1ad46be5dd550aad208fdb1ab7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2400058Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Ye Kuang <yekuang@google.com>
Cr-Commit-Position: refs/heads/master@{#805244}