Revert 144170 - Merge 144108 - [Sync] Disable search engines datatype by default.

chrome/browser/sync/profile_sync_components_factory_impl.cc

Index: chrome/browser/sync/profile_sync_components_factory_impl.cc
===================================================================
--- chrome/browser/sync/profile_sync_components_factory_impl.cc	(revision 144576)
+++ chrome/browser/sync/profile_sync_components_factory_impl.cc	(working copy)
@@ -151,9 +151,9 @@
         new TypedUrlDataTypeController(this, profile_, pss));
   }
 
-  // Search Engine sync is temporarily disabled by default.  Register only if
-  // explicitly enabled.
-  if (command_line_->HasSwitch(switches::kEnableSyncSearchEngines)) {
+  // Search Engine sync is enabled by default.  Register only if explicitly
+  // disabled.
+  if (!command_line_->HasSwitch(switches::kDisableSyncSearchEngines)) {
     pss->RegisterDataTypeController(
         new SearchEngineDataTypeController(this, profile_, pss));
   }