Revert of Move gn _run target generation into test().

mojo/BUILD.gn

Index: mojo/BUILD.gn
diff --git a/mojo/BUILD.gn b/mojo/BUILD.gn
index 554abd9cfe20ad4a76a9492b3e600e8f50a09619..8f0ee8d9bd9127ebfcdc7a9cf5798edaa2b8b3ae 100644
--- a/mojo/BUILD.gn
+++ b/mojo/BUILD.gn
@@ -25,6 +25,46 @@
   }
 
   deps += [ "//mojo/shell:all" ]
+}
+
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("mojo_public_bindings_unittests_run") {
+  testonly = true
+  deps = [
+    # TODO(use_chrome_edk): "//mojo/edk/test:mojo_public_bindings_unittests"
+    "//third_party/mojo/src/mojo/edk/test:mojo_public_bindings_unittests",
+  ]
+}
+
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("mojo_public_environment_unittests_run") {
+  testonly = true
+  deps = [
+    # TODO(use_chrome_edk): "//mojo/edk/test:mojo_public_environment_unittests"
+    "//third_party/mojo/src/mojo/edk/test:mojo_public_environment_unittests",
+  ]
+}
+
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("mojo_public_system_unittests_run") {
+  testonly = true
+  deps = [
+    # TODO(use_chrome_edk): "//mojo/edk/test:mojo_public_system_unittests"
+    "//third_party/mojo/src/mojo/edk/test:mojo_public_system_unittests",
+  ]
+}
+
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("mojo_public_utility_unittests_run") {
+  testonly = true
+  deps = [
+    # TODO(use_chrome_edk): "//mojo/edk/test:mojo_public_utility_unittests"
+    "//third_party/mojo/src/mojo/edk/test:mojo_public_utility_unittests",
+  ]
 }
 
 group("tests") {