Hash pin using existing hash algorithm

Pin is hashed differently than password in PinStorage.
This CL updates LockScreenController to hash pin using its existing hash algorithm.

Bug: 721524
Change-Id: I90f8691aee7fb4dfe179df4fab5de7f6a0ee6c2a
Reviewed-on: https://chromium-review.googlesource.com/653857
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Xiaoyin Hu <xiaoyinh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#500473}

• ash/login/lock_screen_controller.cc[diff]
• ash/login/lock_screen_controller.h[diff]
• ash/login/lock_screen_controller_unittest.cc[diff]
• ash/login/ui/lock_contents_view.cc[diff]
• ash/login/ui/lock_contents_view.h[diff]
• ash/login/ui/lock_screen.cc[diff]
• ash/login/ui/lock_screen.h[diff]
• ash/login/ui/login_auth_user_view.cc[diff]
• ash/login/ui/login_auth_user_view.h[diff]
• ash/public/cpp/ash_pref_names.cc[diff]
• ash/public/cpp/ash_pref_names.h[diff]
• ash/shell.cc[diff]
• chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api_unittest.cc[diff]
• chrome/browser/chromeos/login/lock/screen_locker.cc[diff]
• chrome/browser/chromeos/login/lock/views_screen_locker.cc[diff]
• chrome/browser/chromeos/login/quick_unlock/pin_storage.cc[diff]
• chrome/browser/chromeos/login/quick_unlock/pin_storage.h[diff]
• chrome/browser/chromeos/login/quick_unlock/pin_storage_unittest.cc[diff]
• chrome/browser/chromeos/login/quick_unlock/quick_unlock_storage.cc[diff]
• chrome/browser/chromeos/login/quick_unlock/quick_unlock_storage.h[diff]
• chrome/common/pref_names.cc[diff]
• chrome/common/pref_names.h[diff]
• ui/login/account_picker/md_user_pod_row.js[diff]
• ui/login/account_picker/user_pod_row.js[diff]