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

mojo/public/interfaces/network/BUILD.gn

Index: mojo/public/interfaces/network/BUILD.gn
diff --git a/mojo/public/interfaces/bindings/BUILD.gn b/mojo/public/interfaces/network/BUILD.gn
similarity index 69%
copy from mojo/public/interfaces/bindings/BUILD.gn
copy to mojo/public/interfaces/network/BUILD.gn
index cf8a1183d70bfb3fc3bac1d9571ae357ef0669d0..7eb4a0c804ec98d9c72a45dba9c5365017fc1cce 100644
--- a/mojo/public/interfaces/bindings/BUILD.gn
+++ b/mojo/public/interfaces/network/BUILD.gn
@@ -4,8 +4,10 @@
 
 import("../../tools/bindings/mojom.gni")
 
-mojom("bindings") {
+mojom("network") {
   sources = [
-    "interface_control_messages.mojom",
+    "network_error.mojom",
+    "url_request.mojom",
+    "url_response.mojom",
   ]
 }