GitLab

This change removes overrides from:
* DesktopMediaPickerDialogView, which used static strings
* DownloadDangerPromptViews, which used static strings conditional on a
  constructor parameter
* HungRendererDialogView, which computes its strings but never updates them
  after creation
* PermissionsBubbleDialogDelegateView, which used static strings conditional on
  GetDialogButtons(), which itself returned a constant
* PasswordReuseModalWarningDialog, which used strings computed from a member
  that never changes after construction
* TabModalConfirmDialogViews, which gets its strings from a delegate but never
  updates them
* UninstallView, which used static strings

This change also removes a couple of redundant overrides of GetDialogButtons
that replicated the default, and const-ifies a couple of members where the
const-ness helps reason about code correctness.

Bug: 1011446
Change-Id: I6f89e975895c16a492cc0becad98f43a4f96e6c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862119
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706104}