Remove IOThread class as it's not needed anymore.

Bug: 934009
Change-Id: I193c14948f34ca632ae60ea2834b226c0cb7a1f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1659012
Commit-Queue: John Abd-El-Malek <[email protected]>
Reviewed-by: Eric Roman <[email protected]>
Cr-Commit-Position: refs/heads/master@{#669295}
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 25d03118..4fba9d1 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -26,7 +26,6 @@
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/gpu/gpu_mode_manager.h"
 #include "chrome/browser/intranet_redirect_detector.h"
-#include "chrome/browser/io_thread.h"
 #include "chrome/browser/lifetime/browser_shutdown.h"
 #include "chrome/browser/media/media_device_id_salt.h"
 #include "chrome/browser/media/media_engagement_service.h"
@@ -88,6 +87,7 @@
 #include "components/browsing_data/core/pref_names.h"
 #include "components/certificate_transparency/pref_names.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
+#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_prefs.h"
 #include "components/dom_distiller/core/distilled_page_prefs.h"
 #include "components/feature_engagement/buildflags.h"
 #include "components/flags_ui/pref_service_flags_storage.h"
@@ -521,6 +521,7 @@
 void RegisterLocalState(PrefRegistrySimple* registry) {
   // Please keep this list alphabetized.
   browser_shutdown::RegisterPrefs(registry);
+  data_reduction_proxy::RegisterPrefs(registry);
   BrowserProcessImpl::RegisterPrefs(registry);
   ChromeContentBrowserClient::RegisterLocalStatePrefs(registry);
   ChromeMetricsServiceClient::RegisterPrefs(registry);
@@ -531,7 +532,6 @@
   GpuModeManager::RegisterPrefs(registry);
   identity::IdentityManager::RegisterLocalStatePrefs(registry);
   IntranetRedirectDetector::RegisterPrefs(registry);
-  IOThread::RegisterPrefs(registry);
   language::GeoLanguageProvider::RegisterLocalStatePrefs(registry);
   language::UlpLanguageCodeLocator::RegisterLocalStatePrefs(registry);
   network_time::NetworkTimeTracker::RegisterPrefs(registry);