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This CL removes the IsRefreshInfobarEnabled() flag function and refactors code around its use.

Bug: 884722
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I90dea9cf5e196f455eda1fe516140daa8ad68a8c
Reviewed-on: https://chromium-review.googlesource.com/1245366
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594654}