[fuchsia_modular] Fix strict dependencies

Unused/undeclared deps break the build if it has Dart strict deps enabled.

Bug: b/152752463

Change-Id: Ia6dfbc306a2c4a2f9a123e4613ecea726ec875f4
Reviewed-on: https://fuchsia-review.googlesource.com/c/topaz/+/376533
Reviewed-by: Vickie Cheng <vickiecheng@google.com>
Commit-Queue: Omer Lev-ran <omerlevran@google.com>
diff --git a/public/dart/fuchsia_modular/BUILD.gn b/public/dart/fuchsia_modular/BUILD.gn
index 531e2ea..a4ddb0a 100644
--- a/public/dart/fuchsia_modular/BUILD.gn
+++ b/public/dart/fuchsia_modular/BUILD.gn
@@ -49,7 +49,6 @@
     "//sdk/fidl/fuchsia.sys",
     "//sdk/fidl/fuchsia.ui.app",
     "//sdk/fidl/fuchsia.ui.views",
-    "//third_party/dart-pkg/pub/async",
     "//third_party/dart-pkg/pub/meta",
     "//topaz/public/dart/fidl",
     "//topaz/public/dart/fuchsia",
@@ -57,7 +56,6 @@
     "//topaz/public/dart/fuchsia_scenic",
     "//topaz/public/dart/fuchsia_services",
     "//topaz/public/dart/zircon",
-    "//zircon/system/fidl/fuchsia-mem",
   ]
 }