Fold //ipc/mojo into //ipc.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 9479d9180f64928a79bbbc571da340d0c3c49eb1..afa86fea0c74a58cfbc18d138a51ef1eb9e79554 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -217,7 +217,6 @@ group("both_gn_and_gyp") {
       "//gpu:gpu_unittests",
       "//gpu/ipc/service:gpu_ipc_service_unittests",
       "//ipc:ipc_tests",
-      "//ipc/mojo:ipc_mojo_unittests",
       "//media:media_unittests",
       "//media/cast:cast_unittests",
       "//media/midi:midi_unittests",
@@ -786,7 +785,7 @@ group("gn_mojo_targets") {
     # TODO(GYP): Figure out if any of these should be in gn_all
     # and figure out how cross-platform they are
     deps = [
-      "//ipc/mojo:ipc_mojo_perftests",
+      "//ipc:ipc_tests",
       "//media/mojo:tests",
       "//media/mojo/services",
       "//mojo:tests",