Move ViewHostMsg_CreateWindow to mojom

ui/base/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/buildflag_header.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
+import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 import("//ui/ozone/ozone.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 } else if (is_mac) {
   import("//build/config/mac/rules.gni")
 }
@@ skipping 336 matching lines @@
     # Empty implementation for all other cases.
     sources += [ "touch/touch_device.cc" ]
   }
 
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   defines = [ "UI_BASE_IMPLEMENTATION" ]
 
   public_deps = [
+    ":mojo_bindings",
     ":ui_data_pack",
     ":ui_features",
     "//base",
     "//skia",
     "//ui/events:events_base",
     "//ui/events/platform",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
   deps = [
@@ skipping 578 matching lines @@
 if (is_mac) {
   mac_framework_bundle("ui_unittests_framework") {
     testonly = true
     deps = [
       "//ui/resources:ui_test_pak_bundle_data",
     ]
     info_plist = "test/framework-Info.plist"
     output_name = "ui_unittests Framework"
   }
 }
+
+mojom("mojo_bindings") {
+  sources = [
+    "window_open_disposition.mojom",
+  ]
+}