Enables ASAN build and test for Dart

mojo/BUILD.gn

Index: mojo/BUILD.gn
diff --git a/mojo/BUILD.gn b/mojo/BUILD.gn
index 72b16cad1e69cb2ecedd8e0db23a5eb9e3591d01..6ed78a3a39c6e512e026af833c5e83eb0879aeb8 100644
--- a/mojo/BUILD.gn
+++ b/mojo/BUILD.gn
@@ -56,9 +56,11 @@ group("tests") {
     "//mojo/edk/js:tests",
     "//mojo/edk/system:tests",
     "//mojo/edk/test:public_tests",
+    "//mojo/dart/embedder/test:dart_unittests",
     "//mojo/services/view_manager/public/cpp/tests:mojo_view_manager_lib_unittests",
     "//mojo/tools:message_generator",
     "//services/clipboard:apptests",
+    "//services/dart:dart_apptests",
     "//services/http_server:apptests",
     "//services/js:js_apptests",
     "//services/js:js_services_unittests",
@@ -73,11 +75,4 @@ group("tests") {
   if (use_prebuilt_network_service) {
     deps += [ "//mojo/public/tools:copy_network_service_apptests" ]
   }
-
-  if (!is_asan) {
-    deps += [
-      "//mojo/dart/embedder/test:dart_unittests",
-      "//services/dart:dart_apptests",
-    ]
-  }
 }