Remove old default search preferences.

chrome/browser/prefs/chrome_pref_service_factory.cc

Index: chrome/browser/prefs/chrome_pref_service_factory.cc
diff --git a/chrome/browser/prefs/chrome_pref_service_factory.cc b/chrome/browser/prefs/chrome_pref_service_factory.cc
index 0b72728a91612c7990959c6aec2034f5e6d2d236..b15a2f10fde75db9eba75ea7a4f3c59de0fe115f 100644
--- a/chrome/browser/prefs/chrome_pref_service_factory.cc
+++ b/chrome/browser/prefs/chrome_pref_service_factory.cc
@@ -47,7 +47,6 @@
 #include "components/prefs/pref_store.h"
 #include "components/prefs/pref_value_store.h"
 #include "components/search_engines/default_search_manager.h"
-#include "components/search_engines/default_search_pref_migration.h"
 #include "components/search_engines/search_engines_pref_names.h"
 #include "components/signin/core/common/signin_pref_names.h"
 #include "components/sync/base/model_type.h"
@@ -147,24 +146,6 @@ const PrefHashFilter::TrackedPreferenceMetadata kTrackedPrefs[] = {
     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
     PrefHashFilter::VALUE_IMPERSONAL
   },
-  {
-    8, prefs::kDefaultSearchProviderSearchURL,
-    PrefHashFilter::ENFORCE_ON_LOAD,
-    PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
-    PrefHashFilter::VALUE_IMPERSONAL
-  },
-  {
-    9, prefs::kDefaultSearchProviderKeyword,
-    PrefHashFilter::ENFORCE_ON_LOAD,
-    PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
-    PrefHashFilter::VALUE_IMPERSONAL
-  },
-  {
-    10, prefs::kDefaultSearchProviderName,
-    PrefHashFilter::ENFORCE_ON_LOAD,
-    PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
-    PrefHashFilter::VALUE_IMPERSONAL
-  },
 #if !defined(OS_ANDROID)
   {
     11, prefs::kPinnedTabs,
@@ -518,8 +499,6 @@ std::unique_ptr<sync_preferences::PrefServiceSyncable> CreateProfilePrefs(
   std::unique_ptr<sync_preferences::PrefServiceSyncable> pref_service =
       factory.CreateSyncable(pref_registry.get());
 
-  ConfigureDefaultSearchPrefMigrationToDictionaryValue(pref_service.get());
-
   return pref_service;
 }