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Now password_controller.js is injected by adding it to call of __gCrWeb.findPasswordForms().
It has performance drawbacks since __gCrWeb.findPasswordForms() could be called multiple times.
This CL makes injection of password_controller.js with WKWebView injection.

Also this CL updates the header comment in password_controller.js with up-to-date information.

Bug: 828824, 418827
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I4036e3279e0c3a32301795b46630c49801679106
Reviewed-on: https://chromium-review.googlesource.com/995534
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548496}