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

mojo/edk/embedder/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/config/nacl/config.gni")
 
 source_set("headers") {
   sources = [
     "configuration.h",
     "embedder.h",
@@ skipping 20 matching lines @@
     "//components/nacl:nacl",
   ]
 
   sources = [
     "configuration.h",
     "embedder.cc",
     "embedder.h",
     "embedder_internal.h",
     "entrypoints.cc",
     "entrypoints.h",
+    "scoped_ipc_support.cc",
+    "scoped_ipc_support.h",
 
     # Test-only code:
     # TODO(vtl): It's a little unfortunate that these end up in the same
     # component as non-test-only code. In the static build, this code should
     # hopefully be dead-stripped.
     "test_embedder.cc",
     "test_embedder.h",
   ]
 
   defines = [ "MOJO_SYSTEM_IMPL_IMPLEMENTATION" ]
@@ skipping 93 matching lines @@
 
   deps = [
     "//base",
     "//base/test:test_support",
     "//mojo/edk/system",
     "//mojo/edk/system:test_utils",
     "//mojo/edk/test:test_support",
     "//testing/gtest",
   ]
 }