Move mojom definitions of URL{Request,Response} into SDK

mojo/services/url_response_disk_cache/public/interfaces/BUILD.gn

Index: mojo/services/url_response_disk_cache/public/interfaces/BUILD.gn
diff --git a/mojo/services/url_response_disk_cache/public/interfaces/BUILD.gn b/mojo/services/url_response_disk_cache/public/interfaces/BUILD.gn
index aac931e1dc928612f4fd3874dc29686d613945c0..4320ff116f521a6cd877df148c1bf8ee4a4da1cf 100644
--- a/mojo/services/url_response_disk_cache/public/interfaces/BUILD.gn
+++ b/mojo/services/url_response_disk_cache/public/interfaces/BUILD.gn
@@ -12,13 +12,5 @@ mojom("interfaces") {
 
   import_dirs = [ get_path_info("../../../", "abspath") ]
 
-  if (defined(mojo_network_service_root)) {
-    import_dirs += [ mojo_network_service_root ]
-  } else {
-    mojo_network_service_root = "../../.."
-  }
-
-  deps = [
-    "$mojo_network_service_root/network/public/interfaces",
-  ]
+  mojo_sdk_deps = [ "mojo/public/interfaces/network" ]
 }