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This CL fixes NavigationContext::IsRendererInitiated for reloads and
WebStatePolicyDecider::RequestInfo::transition_type for
browser-initiated navigation.

Bug: 676129, 725239
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I608b208d204bc055fcfd6c34dd7bd2a04b9c232a
Reviewed-on: https://chromium-review.googlesource.com/c/1282448
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600460}