Remove chromeos:: from types in c/b/ash/login/users/

Follow up to https://crrev.com/c/2748581. Now that c/b/ash/login/users/
lives in the ash namespace, we should remove explicit uses of the old
namespace.

Bug: 1164001
Change-Id: I820dadd3819950518e15e3865d4381bc62eb504d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2752629
Commit-Queue: Henrique Ferreiro <[email protected]>
Owners-Override: Henrique Ferreiro <[email protected]>
Reviewed-by: Hidehiko Abe <[email protected]>
Cr-Commit-Position: refs/heads/master@{#866946}
diff --git a/chrome/browser/extensions/update_install_gate_unittest.cc b/chrome/browser/extensions/update_install_gate_unittest.cc
index 99e2058..2e26fb5 100644
--- a/chrome/browser/extensions/update_install_gate_unittest.cc
+++ b/chrome/browser/extensions/update_install_gate_unittest.cc
@@ -116,7 +116,7 @@
 #if BUILDFLAG(IS_CHROMEOS_ASH)
     const AccountId account_id(AccountId::FromUserEmail(kUserProfile));
     // Needed to allow ChromeProcessManagerDelegate to allow background pages.
-    fake_user_manager_ = new chromeos::FakeChromeUserManager();
+    fake_user_manager_ = new ash::FakeChromeUserManager();
     // Takes ownership of fake_user_manager_.
     scoped_user_manager_enabler_ =
         std::make_unique<user_manager::ScopedUserManager>(
@@ -217,7 +217,7 @@
 
 #if BUILDFLAG(IS_CHROMEOS_ASH)
   // Needed for creating ExtensionService.
-  chromeos::FakeChromeUserManager* fake_user_manager_ = nullptr;
+  ash::FakeChromeUserManager* fake_user_manager_ = nullptr;
   std::unique_ptr<user_manager::ScopedUserManager> scoped_user_manager_enabler_;
 #endif