Decompose //extensions/browser/BUILD.gn

extensions/browser/guest_view/extension_view/whitelist/BUILD.gn

Index: extensions/browser/guest_view/extension_view/whitelist/BUILD.gn
diff --git a/services/catalog/public/interfaces/BUILD.gn b/extensions/browser/guest_view/extension_view/whitelist/BUILD.gn
similarity index 65%
copy from services/catalog/public/interfaces/BUILD.gn
copy to extensions/browser/guest_view/extension_view/whitelist/BUILD.gn
index 77a6aaf1308f91c071606fe80b4f205e6a59fc00..2ebc9d7e42c8485c1d8ffb54aa5c8f5204f8202d 100644
--- a/services/catalog/public/interfaces/BUILD.gn
+++ b/extensions/browser/guest_view/extension_view/whitelist/BUILD.gn
@@ -2,10 +2,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//mojo/public/tools/bindings/mojom.gni")
-
-mojom("interfaces") {
+source_set("whitelist") {
   sources = [
-    "catalog.mojom",
+    "extension_view_whitelist.cc",
+    "extension_view_whitelist.h",
   ]
 }