[iOS][MF] Starts FormInputAccessoryCoordinator with a BrowserState

self.browserState was nil at the point of initialization.

Bug: 845472
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Id3fb457b493cecc1686144160a486fb6446fdea2
Reviewed-on: https://chromium-review.googlesource.com/1186334
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588884}
1 file changed