Move dart_content_handler and tonic to //topaz.

Change-Id: Id2968c17bbc2cd3dd88e3be37a4d6bf7473a1953
diff --git a/dart/dart_fuchsia_test.gni b/dart/dart_fuchsia_test.gni
index 29bf9b0..e701b59 100644
--- a/dart/dart_fuchsia_test.gni
+++ b/dart/dart_fuchsia_test.gni
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//apps/dart_content_handler/dart_app.gni")
+import("//topaz/runtime/dart_runner/dart_app.gni")
 
 # Defines a device-side test binary
 #