Revert of Moving previews code from components/ to chrome/

components/previews/core/previews_ui_service.cc

Index: components/previews/core/previews_ui_service.cc
diff --git a/components/previews/core/previews_ui_service.cc b/components/previews/core/previews_ui_service.cc
index 44cbb21c9609c490abd7c9641b6dfc974793d6a0..af146cc81f10fa7ebbaa270c3cddd14a7bd3c230 100644
--- a/components/previews/core/previews_ui_service.cc
+++ b/components/previews/core/previews_ui_service.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/single_thread_task_runner.h"
+#include "components/previews/core/previews_io_data.h"
 #include "url/gurl.h"
 
 namespace previews {
@@ -13,12 +14,10 @@
 PreviewsUIService::PreviewsUIService(
     PreviewsIOData* previews_io_data,
     const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
-    std::unique_ptr<PreviewsOptOutStore> previews_opt_out_store,
-    const PreviewsIsEnabledCallback& is_enabled_callback)
+    std::unique_ptr<PreviewsOptOutStore> previews_opt_out_store)
     : io_task_runner_(io_task_runner), weak_factory_(this) {
   previews_io_data->Initialize(weak_factory_.GetWeakPtr(),
-                               std::move(previews_opt_out_store),
-                               is_enabled_callback);
+                               std::move(previews_opt_out_store));
 }
 
 PreviewsUIService::~PreviewsUIService() {