Remove mojo::edk::test::ScopedIPCSupport

mojo/edk/embedder/BUILD.gn

Index: mojo/edk/embedder/BUILD.gn
diff --git a/mojo/edk/embedder/BUILD.gn b/mojo/edk/embedder/BUILD.gn
index 67a7376eb45df3def2e4e0345b2d6741b1cc4ffb..c652e517527727e2856e27f081b463c49d34bf5e 100644
--- a/mojo/edk/embedder/BUILD.gn
+++ b/mojo/edk/embedder/BUILD.gn
@@ -15,7 +15,6 @@ source_set("headers") {
     "platform_channel_pair.h",
     "platform_handle.h",
     "platform_handle_utils.h",
-    "process_delegate.h",
     "scoped_platform_handle.h",
   ]
 
@@ -54,7 +53,6 @@ source_set("embedder") {
   defines = [ "MOJO_SYSTEM_IMPL_IMPLEMENTATION" ]
 
   public_deps = [
-    ":delegates",
     ":headers",
     ":platform",
     "//base",
@@ -121,25 +119,6 @@ source_set("platform") {
   }
 }
 
-source_set("delegates") {
-  # This isn't really a standalone target; it must be linked into the
-  # mojo_system_impl component.
-  visibility = [
-    ":embedder",
-    "//mojo/edk/system",
-  ]
-
-  sources = [
-    "process_delegate.h",
-  ]
-
-  defines = [ "MOJO_SYSTEM_IMPL_IMPLEMENTATION" ]
-
-  public_deps = [
-    "//mojo/public/cpp/system",
-  ]
-}
-
 source_set("embedder_unittests") {
   testonly = true