Dart: Removes dartzip

mojo/dart/observatory_test/BUILD.gn

Index: mojo/dart/observatory_test/BUILD.gn
diff --git a/mojo/dart/observatory_test/BUILD.gn b/mojo/dart/observatory_test/BUILD.gn
index 08c8415c2f048a7487090894ece3d8e840b66715..87c2389863cace992959e30545b39436ed257734 100644
--- a/mojo/dart/observatory_test/BUILD.gn
+++ b/mojo/dart/observatory_test/BUILD.gn
@@ -4,18 +4,9 @@
 
 import("//mojo/public/dart/rules.gni")
 
-dartzip_packaged_application("observatory_test_dartzip") {
-  sources = [
-    "lib/main.dart",
-    "pubspec.yaml",
-  ]
-  deps = [
-    "//mojo/public/dart:dart_dartzip",
-  ]
-}
-
-dart_pkg("observatory_test_pkg") {
+dart_pkg("observatory_test") {
   apps = [ "lib/main.dart" ]
+  app_name_override = "dart_observatory_test"
   sources = [
     "pubspec.yaml",
   ]
@@ -23,10 +14,3 @@ dart_pkg("observatory_test_pkg") {
     "//mojo/public/dart",
   ]
 }
-
-group("observatory_test") {
-  deps = [
-    ":observatory_test_dartzip",
-    ":observatory_test_pkg",
-  ]
-}