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

mojo/dart/embedder/BUILD.gn

Index: mojo/dart/embedder/BUILD.gn
diff --git a/mojo/dart/embedder/BUILD.gn b/mojo/dart/embedder/BUILD.gn
index 26a8bddfe063712ecbcb108acc49ac86ef373ffd..713f5da879129b9649e1bc85659d516c5b3e4af6 100644
--- a/mojo/dart/embedder/BUILD.gn
+++ b/mojo/dart/embedder/BUILD.gn
@@ -79,6 +79,7 @@ group("dart_embedder_packages") {
     ":dart_embedder_package_sdk",
     ":dart_embedder_package_application",
     ":dart_embedder_package_bindings",
+    ":dart_embedder_package_network",
     ":dart_embedder_package_network_service",
   ]
 }
@@ -93,6 +94,11 @@ dart_embedder_package("dart_embedder_package_bindings") {
   destination = "mojom/mojo"
 }
 
+dart_embedder_package("dart_embedder_package_network") {
+  package = "mojo/public/interfaces/network"
+  destination = "mojom/mojo"
+}
+
 dart_embedder_package("dart_embedder_package_network_service") {
   package = "mojo/services/network/public/interfaces"
   destination = "mojom/mojo"
@@ -332,6 +338,7 @@ action("generate_snapshot_bin") {
 
   application_mojoms = rebase_path("//mojo/public/interfaces/application")
   bindings_mojoms = rebase_path("//mojo/public/interfaces/bindings")
+  network_mojoms = rebase_path("//mojo/public/interfaces/network")
   network_service_mojoms =
       rebase_path("//mojo/services/network/public/interfaces")
 
@@ -346,6 +353,7 @@ action("generate_snapshot_bin") {
                     # Embedder package directories.
                     "$application_mojoms,mojom/mojo",
                     "$bindings_mojoms,mojom/mojo",
+                    "$network_mojoms,mojom/mojo",
                     "$network_service_mojoms,mojom/mojo",
                   ],
                   "list lines")