CL in https://chromium-review.googlesource.com/c/chromium/src/+/1328985

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c7586428da170b5323c25305dd3e213c38c6aa41

commit c7586428da170b5323c25305dd3e213c38c6aa41
Author: Mario Sanchez Prada <mario@igalia.com>
Date: Fri Nov 09 17:58:16 2018

Migrate clear_browsing_data_collection_view_controller_unittest.mm to IdentityManager

Use IdentityTestEnvironmentChromeBrowserStateAdaptor instead of manually
creating the browser's state by providing specific factories, and then
use the APIs from IdentityTestEnvironment, instead of SigninManagerBase.

Also remove an unnecessary DCHECK in clear_browsing_data_manager_unittest.mm,
as pointed out post-review when fixing  crbug.com/890826  (CL 1318974).

Bug:  903703 
Change-Id: I9d4dd625441005a36c962628fe3fe1f15ab56bb6
Reviewed-on: https://chromium-review.googlesource.com/c/1328985
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#606894}
[modify] https://crrev.com/c7586428da170b5323c25305dd3e213c38c6aa41/ios/chrome/browser/ui/settings/BUILD.gn
[modify] https://crrev.com/c7586428da170b5323c25305dd3e213c38c6aa41/ios/chrome/browser/ui/settings/clear_browsing_data_collection_view_controller_unittest.mm
[modify] https://crrev.com/c7586428da170b5323c25305dd3e213c38c6aa41/ios/chrome/browser/ui/settings/clear_browsing_data_manager_unittest.mm