[iOS][MF] Remove animation between fields

Bug: 878388
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Ic68969370562563a90159167bada0b822893ff8b
Reviewed-on: https://chromium-review.googlesource.com/1212983Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590345}

ios/chrome/browser/autofill/form_input_accessory_view_controller.mm

@@ -182,6 +182,12 @@ CGFloat const kInputAccessoryHeight = 44.0f;
 }
 
 - (void)keyboardWillOrDidChangeFrame:(NSNotification*)notification {
+  // Work Around. On focus event, keyboardReplacementView is animated but the
+  // keyboard isn't. Cancel the animation to match the keyboard behavior
+  if (!IsIPadIdiom()) {
+    [self.keyboardReplacementView.layer removeAllAnimations];
+  }
+
   CGRect keyboardFrame =
       [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
   UIView* keyboardView = [self getKeyboardView];