[Android] Move PrefChangeRegistrar to components/prefs

Make it possible to observe local_state instead of Profile prefs.

Bug: 381122436,40132529
Change-Id: Ib7ec2cfac791505b89586df7d682de40bdba2149
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6055147
Reviewed-by: Theresa Sullivan <[email protected]>
Reviewed-by: Ted Choc <[email protected]>
Commit-Queue: Henrique Nakashima <[email protected]>
Reviewed-by: Yaron Friedman <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1390455}
diff --git a/components/prefs/BUILD.gn b/components/prefs/BUILD.gn
index e31c110f..9deb408f 100644
--- a/components/prefs/BUILD.gn
+++ b/components/prefs/BUILD.gn
@@ -64,6 +64,8 @@
 
   if (is_android) {
     sources += [
+      "android/pref_change_registrar_android.cc",
+      "android/pref_change_registrar_android.h",
       "android/pref_service_android.cc",
       "android/pref_service_android.h",
     ]