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CSP has a directive 'connect-src' that can prevent xhr requests. We proxy these requests to the
native iOS app to circumvent CSP. The native apps then takes the response and returns it to the
original xhr object. This fixes all remaining CSP issues with translate on iOS.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I53e633bffbf6fea4b025651ad1c0efe8f367aaf7
Bug: 686364
Reviewed-on: https://chromium-review.googlesource.com/c/1285513
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604786}