[simple-browser] remove unused lib.widgets dep

Verified with:

    fx set workstation.chromebook-x64 \
      --with //src/experiences:tests
    fx build

Change-Id: I218a6035f059d125929b8ee2f57807bd9fcf260a
Reviewed-on: https://fuchsia-review.googlesource.com/c/experiences/+/386720
Reviewed-by: Chase Latta <chaselatta@google.com>
Reviewed-by: Yeonhee Lee <yhlee@google.com>
Commit-Queue: Jason Campbell <jasoncampbell@google.com>
diff --git a/bin/simple_browser/BUILD.gn b/bin/simple_browser/BUILD.gn
index 655e48b..718d199 100644
--- a/bin/simple_browser/BUILD.gn
+++ b/bin/simple_browser/BUILD.gn
@@ -42,7 +42,6 @@
     "//topaz/public/dart/fuchsia_logger",
     "//topaz/public/dart/fuchsia_scenic_flutter",
     "//topaz/public/dart/fuchsia_services",
-    "//topaz/public/dart/widgets:lib.widgets",
   ]
 
   resources = [
diff --git a/bin/simple_browser_internationalization/BUILD.gn b/bin/simple_browser_internationalization/BUILD.gn
index 1545d5d..e11864f 100644
--- a/bin/simple_browser_internationalization/BUILD.gn
+++ b/bin/simple_browser_internationalization/BUILD.gn
@@ -34,6 +34,5 @@
     "//third_party/dart-pkg/git/flutter/packages/flutter_localizations",
     "//third_party/dart/third_party/pkg/intl",
     "//topaz/public/dart/fuchsia_internationalization_flutter",
-    "//topaz/public/dart/widgets:lib.widgets",
   ]
 }