Revert "Creates a WebUI-based Crostini Upgrader"

This reverts commit 29c8bb394dd8b8c03e006efb39ec77fc42f96900.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 717476 as the
culprit for failures in the build cycles as shown on:
https://analysis.chromium.org/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzI5YzhiYjM5NGRkOGI4YzAzZTAwNmVmYjM5ZWM3N2ZjNDJmOTY5MDAM

Sample Failed Build: https://ci.chromium.org/b/8896211200981346592

Sample Failed Step: compile

Original change's description:
> Creates a WebUI-based Crostini Upgrader
> 
> The UI is behind the new crostini-webui-upgrader flag
> (currently disabled by default)
> 
> The main areas for review are
> 
> calamity@:
> html/js  - chrome/browser/chromeos/crostini_upgrader/
> mojo and webui glue classes - chrome/browser/ui/webui/crostini_upgrader/
> 
> davidmunro@
> crostini business logic - chrome/browser/chromeos/crostini/
> 
> In this CL, the optional container backup stage is stubbed, and will be
> in a subsequent CL.
> 
> A suite of unit/browser tests are also currently lacking. I intend them for
> follow-up CLs.
> 
> 
> Bug: 930901
> Change-Id: Ic52c5242e6c57232ffa6be5d6af65aaff5e8f4ff
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900520
> Commit-Queue: Nicholas Verne <nverne@chromium.org>
> Reviewed-by: Sam McNally <sammc@chromium.org>
> Reviewed-by: calamity <calamity@chromium.org>
> Reviewed-by: Ken Rockot <rockot@google.com>
> Cr-Commit-Position: refs/heads/master@{#717476}


Change-Id: I704f549216a7d1dc21942fbf6cf4ab9a1d600380
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 930901
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1928159
Cr-Commit-Position: refs/heads/master@{#717481}
  static CrostiniUpgrader* GetForProfile(Profile* profile) {
    return static_cast<CrostiniUpgrader*>(
        GetInstance()->GetServiceForBrowserContext(profile, true));
  }

  static CrostiniUpgrader* GetForProfile(Profile* profile) {
    return static_cast<CrostiniUpgrader*>(
        GetInstance()->GetServiceForBrowserContext(profile, true));
  }
