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Frame messaging enables autofill to work in iframes. |suggestion_controller.js|
needs to also be injected into all frames in order use the JSSuggestionManager
APIs. (Such as navigating to the previous and next form items.)

Bug: None
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I69c47b8245cca136e200a0129f6bb79e093aa630
Reviewed-on: https://chromium-review.googlesource.com/1239372
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593831}