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We plan to ship the new CodeBrowser backend of WebOTP via Finch. This
patch adds necessary code on the client side.

Bug: 1153880
Change-Id: I550ff16d34ec638a0275007b2e1481dec8295115
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580539
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836321}