The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/54d7eb0b3a09f39e9db65452d72209bee09fd006

commit 54d7eb0b3a09f39e9db65452d72209bee09fd006
Author: sammiequon <sammiequon@chromium.org>
Date: Fri Jun 02 03:45:47 2017

md-settings: wrap lock screen dialogs in dom-if.

Also had to modify some tests. This also fixes issue where lock screen page flickers when pressing back button on people page, after canceling a password authentication.

TEST=manual, browser_test --gtest_filter="CrSettingsPeoplePageLockScreenTest.*:CrSettingsPeoplePageSetupPinDialogTest.*:CrSettingsFingerprintListTest.*"
BUG= 723092 ,728394
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2893053002
Cr-Commit-Position: refs/heads/master@{#476554}

[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.html
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/browser/resources/settings/people_page/fingerprint_list.html
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/browser/resources/settings/people_page/fingerprint_list.js
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/browser/resources/settings/people_page/lock_screen.html
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/browser/resources/settings/people_page/lock_screen.js
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/browser/resources/settings/people_page/password_prompt_dialog.html
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/browser/resources/settings/people_page/password_prompt_dialog.js
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/browser/resources/settings/people_page/setup_fingerprint_dialog.js
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/browser/resources/settings/people_page/setup_pin_dialog.html
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/browser/resources/settings/people_page/setup_pin_dialog.js
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/test/data/webui/settings/fingerprint_browsertest_chromeos.js
[modify] https://crrev.com/54d7eb0b3a09f39e9db65452d72209bee09fd006/chrome/test/data/webui/settings/quick_unlock_authenticate_browsertest_chromeos.js