Move ViewHostMsg_CreateWindow to mojom

third_party/WebKit/public/BUILD.gn

Index: third_party/WebKit/public/BUILD.gn
diff --git a/third_party/WebKit/public/BUILD.gn b/third_party/WebKit/public/BUILD.gn
index 40523f7cd0dd02bd7b3af464f1f465d4fa1e7486..aa8d4b4856a121d1b03f0c1b28066b979da1355c 100644
--- a/third_party/WebKit/public/BUILD.gn
+++ b/third_party/WebKit/public/BUILD.gn
@@ -671,6 +671,8 @@ mojom("new_wrapper_types_mojo_bindings") {
     "platform/modules/permissions/permission_status.mojom",
     "platform/modules/presentation/presentation.mojom",
     "platform/modules/websockets/websocket.mojom",
+    "platform/referrer.mojom",
+    "web/window_features.mojom",
   ]
   public_deps = [
     "//url/mojo:url_mojom_gurl",
@@ -732,3 +734,16 @@ group("generate_mojo_bindings") {
     ":offscreen_canvas_mojo_bindings_blink__generator",
   ]
 }
+
+# Some mojom typemaps are shared between Chromium and Blink variants and
+# therefore require some shared traits implementation. These definitions are
+# relegated to a separate target to avoid duplication between the variants.
+source_set("shared_typemap_traits") {
+  visibility = [ ":*" ]
+  sources = [
+    "web/WindowFeaturesStructTraits.cpp",
+  ]
+  deps = [
+    ":new_wrapper_types_mojo_bindings__generator",
+  ]
+}