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A new mailto handler provider is being added to Chrome for iOS. This flag will
wrap all invocations of the new provider during development.

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I9e24a5f256fc5e220120e173080a67301084b506
Reviewed-on: https://chromium-review.googlesource.com/876729Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: Daniel Blakemore <danblakemore@google.com>
Cr-Commit-Position: refs/heads/master@{#532980}