Dart: Rebase generated imports from the SDK to the SDK base directory.

mojo/services/location/public/interfaces/BUILD.gn

Index: mojo/services/location/public/interfaces/BUILD.gn
diff --git a/mojo/services/location/public/interfaces/BUILD.gn b/mojo/services/location/public/interfaces/BUILD.gn
index e0498d89513ca489a3421e46c643ecf907ef1384..d4ed5f61c64bf06abcdb4b2513c8b848df5a653d 100644
--- a/mojo/services/location/public/interfaces/BUILD.gn
+++ b/mojo/services/location/public/interfaces/BUILD.gn
@@ -15,4 +15,6 @@ mojom("interfaces") {
   import_dirs = [ get_path_info("../../../", "abspath") ]
 
   mojo_sdk_deps = [ "mojo/public/interfaces/application" ]
+
+  import_from = mojo_root
 }