Rationalize Dart mojo and sky package structure

mojo/dart/embedder/test/validation_unittest.cc

Index: mojo/dart/embedder/test/validation_unittest.cc
diff --git a/mojo/dart/embedder/test/validation_unittest.cc b/mojo/dart/embedder/test/validation_unittest.cc
index d6a1f8f9c38a0d87e3bf3e781c305878695d3b53..bf5b87c929a6cd819c9d0a687cbbaeab8c76bc64 100644
--- a/mojo/dart/embedder/test/validation_unittest.cc
+++ b/mojo/dart/embedder/test/validation_unittest.cc
@@ -60,7 +60,8 @@ static void RunTest(const std::string& test) {
   base::FilePath package_root;
   PathService::Get(base::DIR_EXE, &package_root);
   package_root = package_root.AppendASCII("gen")
-                             .AppendASCII("dart-gen");
+                             .AppendASCII("dart-pkg")
+                             .AppendASCII("packages");
 
   char* error = NULL;
   bool unhandled_exception = false;