GitLab

This change updates:
* AcceleratorConfirmationDialog, to pass the provided callbacks
  directly to DialogDelegate
* RemoveQueryConfirmationDialog, to use inline callback lambdas
  instead of overrides
* MultiprofilesIntroDialog, to use inline callback lambdas
* SessionAbortedDialog, to use an inline callback lambda
* TeleportWarningDialog, to use inline callback lambdas
* AccessibilityFeatureDisableDialog, to pass the provided callbacks
  directly to DialogDelegate
* ScreenSwitchCheckController, to use private callback methods
* LogoutConfirmationDialog, to use a private callback method
* ShutdownConfirmationDialog, to pass the provided callbacks
  directly to DialogDelegate

Bug: 1011446
Change-Id: Ib2608d8f9095335d1a00fea3b498cd7c29c23d3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2047413
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741316}