Remove dead code.

user_manager is never actually used, except to check if it's there.
UserManager::Get(), in turn, fails a CHECK if there is no UserManager.

Bug: none
Change-Id: I6e3adfc1b5143447f90e2f3cd04ff1e6af5d64b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846078
Auto-Submit: David Benjamin <davidben@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703754}

chrome/browser/profiles/profile_io_data.cc

@@ -267,28 +267,24 @@ void ProfileIOData::InitializeOnUIThread(Profile* profile) {
     params->system_key_slot_use_type = SystemKeySlotUseType::kUseForClientAuth;
   }
 
-  user_manager::UserManager* user_manager = user_manager::UserManager::Get();
-  if (user_manager) {
-    const user_manager::User* user =
-        chromeos::ProfileHelper::Get()->GetUserByProfile(profile);
-    // No need to initialize NSS for users with empty username hash:
-    // Getters for a user's NSS slots always return NULL slot if the user's
-    // username hash is empty, even when the NSS is not initialized for the
-    // user.
-    if (user && !user->username_hash().empty()) {
-      params->username_hash = user->username_hash();
-      DCHECK(!params->username_hash.empty());
-      base::PostTask(
-          FROM_HERE, {BrowserThread::IO},
-          base::BindOnce(&StartNSSInitOnIOThread, user->GetAccountId(),
-                         user->username_hash(), profile->GetPath()));
-
-      // Use the device-wide system key slot only if the user is affiliated on
-      // the device.
-      if (user->IsAffiliated()) {
-        params->system_key_slot_use_type =
-            SystemKeySlotUseType::kUseForClientAuthAndCertManagement;
-      }
+  const user_manager::User* user =
+      chromeos::ProfileHelper::Get()->GetUserByProfile(profile);
+  // No need to initialize NSS for users with empty username hash:
+  // Getters for a user's NSS slots always return a null slot if the user's
+  // username hash is empty, even when the NSS is not initialized for the
+  // user.
+  if (user && !user->username_hash().empty()) {
+    params->username_hash = user->username_hash();
+    DCHECK(!params->username_hash.empty());
+    base::PostTask(FROM_HERE, {BrowserThread::IO},
+                   base::BindOnce(&StartNSSInitOnIOThread, user->GetAccountId(),
+                                  user->username_hash(), profile->GetPath()));
+
+    // Use the device-wide system key slot only if the user is affiliated on
+    // the device.
+    if (user->IsAffiliated()) {
+      params->system_key_slot_use_type =
+          SystemKeySlotUseType::kUseForClientAuthAndCertManagement;
     }
   }