Renames Badge api to ExperimentalBadge for OriginTrial

This is to satisfy the requirement that there should be some breakage
when an origin trial ends.

Note: When the origin trial finishes, this CL should be reverted.

Bug: 719176
Change-Id: I3520d4e99896bc4dbe81833e536b471b2f606e47
Reviewed-on: https://chromium-review.googlesource.com/c/1420177
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624504}
9 files changed