Remove SoleIntegration flag

Sole integration was launched in M65, and we no longer need this flag.

Bug: 778805
Change-Id: I6669a87dcb7a6ff4705a30aaa2cf71d6670a822a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1578101
Commit-Queue: Wei-Yin Chen (陳威尹) <[email protected]>
Reviewed-by: Theresa <[email protected]>
Cr-Commit-Position: refs/heads/master@{#653718}
8 files changed