Migrate chrome/browser/ash/net/ to namespace ash

This CL is part of the Chrome OS source code directory migration:
https://docs.google.com/document/d/1g-98HpzA8XcoGBWUv1gQNr4rbnD5yfvbtYZyPDDbkaE.

Bug: 1164001
Change-Id: I1affc0e26f78ce2baa936145c30a1fc060b23f22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3344758
Reviewed-by: Hidehiko Abe <[email protected]>
Owners-Override: Hidehiko Abe <[email protected]>
Commit-Queue: Henrique Ferreiro <[email protected]>
Cr-Commit-Position: refs/heads/main@{#957060}
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index fb4d668c..e64a2fb5 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -1073,7 +1073,7 @@
   ash::login::SecurityTokenSessionController::RegisterLocalStatePrefs(registry);
   ash::MultiProfileUserController::RegisterPrefs(registry);
   chromeos::NetworkMetadataStore::RegisterPrefs(registry);
-  chromeos::NetworkThrottlingObserver::RegisterPrefs(registry);
+  ash::NetworkThrottlingObserver::RegisterPrefs(registry);
   ash::PowerMetricsReporter::RegisterLocalStatePrefs(registry);
   ash::platform_keys::KeyPermissionsManagerImpl::RegisterLocalStatePrefs(
       registry);
@@ -1424,7 +1424,7 @@
   policy::ExtensionInstallEventLogManagerWrapper::RegisterProfilePrefs(
       registry);
   policy::StatusCollector::RegisterProfilePrefs(registry);
-  chromeos::SystemProxyManager::RegisterProfilePrefs(registry);
+  ash::SystemProxyManager::RegisterProfilePrefs(registry);
   ChromeShelfPrefs::RegisterProfilePrefs(registry);
   ::onc::RegisterProfilePrefs(registry);
   ash::cert_provisioning::RegisterProfilePrefs(registry);