Make integration tests use the default_integration policy.

The default_integration policy should be used when no exp= is otherwise
specified to make sure that the GFE cache is not used.

Bug: 950734
Change-Id: I6129845bed78f84175fb440003575f626431ccbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1560454
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Simon Pelchat <spelchat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652616}
7 files changed