Preloading: Move prefetch_prefs to chrome/browser/preloading/

This CL moves prefetch_prefs.{cc,h} from chrome/browser/prefetch/ to
chrome/browser/preloading/ and renames them to preloading_prefs.{cc,h}
as these are commonly used for preloading, not only for prefetch.

This is a mechanical change that doesn't affect functional behavior.

Bug: 1356268
Change-Id: I820ab3b65a7c8563064f0eaa5a4291dcaa4774a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4846057
Reviewed-by: Lingqi Chi <[email protected]>
Reviewed-by: Ken Okada <[email protected]>
Reviewed-by: Colin Blundell <[email protected]>
Commit-Queue: Hiroki Nakagawa <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1194128}
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 9e2256e6..381d4d01 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -52,12 +52,12 @@
 #include "chrome/browser/notifications/notifier_state_tracker.h"
 #include "chrome/browser/notifications/platform_notification_service_impl.h"
 #include "chrome/browser/permissions/quiet_notification_permission_ui_state.h"
-#include "chrome/browser/prefetch/prefetch_prefs.h"
 #include "chrome/browser/prefs/chrome_pref_service_factory.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/prefs/session_startup_pref.h"
 #include "chrome/browser/preloading/prefetch/prefetch_service/prefetch_origin_decider.h"
 #include "chrome/browser/preloading/prefetch/search_prefetch/search_prefetch_service.h"
+#include "chrome/browser/preloading/preloading_prefs.h"
 #include "chrome/browser/printing/print_preview_sticky_settings.h"
 #include "chrome/browser/profiles/chrome_version_service.h"
 #include "chrome/browser/profiles/profile.h"