Move ScopedIPCSupport to mojo/edk/embedder and the mojo::edk namespace.

ipc/mojo/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("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 mojom("mojom") {
   sources = [
     "ipc.mojom",
@@ skipping 21 matching lines @@
   deps = [
     ":mojom",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//ipc",
     "//mojo/public/c/system",
     "//mojo/public/cpp/bindings",
   ]
 }
 
-source_set("ipc_support") {
-  sources = [
-    "scoped_ipc_support.cc",
-    "scoped_ipc_support.h",
-  ]
-
-  deps = [
-    "//base",
-    "//mojo/edk/system",
-  ]
-}
-
 test("ipc_mojo_unittests") {
   sources = [
     "ipc_channel_mojo_unittest.cc",
     "ipc_mojo_bootstrap_unittest.cc",
     "run_all_unittests.cc",
   ]
 
   deps = [
     ":mojo",
     ":mojom",
@@ skipping 26 matching lines @@
     "//mojo/edk/system",
     "//mojo/edk/test:test_support",
     "//mojo/edk/test:test_support_impl",
     "//url",
   ]
 
   if (is_linux && !is_component_build) {
     public_configs = [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
   }
 }