[flutter_tools] remove linter dep from BUILD.gn (#49373)

packages/flutter_tools/BUILD.gn

diff --git a/packages/flutter_tools/BUILD.gn b/packages/flutter_tools/BUILD.gn
index cdfafe1..9427c1f 100644
--- a/packages/flutter_tools/BUILD.gn
+++ b/packages/flutter_tools/BUILD.gn
@@ -29,7 +29,6 @@
     # because it uses mirrors which Fuchsia's Dart VM doesn't support.
     "//third_party/dart-pkg/pub/json_rpc_2",
     "//third_party/dart-pkg/pub/json_schema",
-    "//third_party/dart-pkg/pub/linter",
     "//third_party/dart-pkg/pub/meta",
     "//third_party/dart-pkg/pub/mime",
     "//third_party/dart-pkg/pub/multi_server_socket",