Move window_manager service implementation to //services

services/BUILD.gn

Index: services/BUILD.gn
diff --git a/services/BUILD.gn b/services/BUILD.gn
index b5ad9f3180da27156d3ce75a4587a26899f916f2..549a5afe5b20e3eff26d0e1cf5f3d5837be06df6 100644
--- a/services/BUILD.gn
+++ b/services/BUILD.gn
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/ui.gni")
+
 group("services") {
   deps = [
     "//services/http_server",
@@ -9,4 +11,10 @@ group("services") {
     "//services/js",
     "//services/tracing",
   ]
+
+  if (use_aura) {
+    deps += [
+      "//services/window_manager",
+    ]
+  }
 }