Move API for field trial params to base from variations.
Now that the underlying implementation also works in sub-processes,
this CL moves the APIs to base (naming the field trial params), so
that they can be easily accessed by all Chrome sub-processes.
Marks the existing variation params APIs as deprecated. Existing
callers can be migrates via future CLs and these can then be
removed.
Unit tests also moved to base.
BUG=681160
Review-Url: https://codereview.chromium.org/2667553002
Cr-Commit-Position: refs/heads/master@{#447108}
CrOS-Libchrome-Original-Commit: 79ab08c0137f5485173e8de5cd28201774ce1a0f
3 files changed