Rename PasswordControllerHelper to PasswordFormHelper

Bug: 865114
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: If08aa34d7c17e9f5a6dabb818669012275443587
Reviewed-on: https://chromium-review.googlesource.com/c/1278670
Commit-Queue: Scott Wu <scottwu@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599167}
9 files changed