Replicate to all renderers the accepted languages set by a layout test.

components/test_runner/tracked_dictionary.cc

Index: components/test_runner/tracked_dictionary.cc
diff --git a/components/test_runner/tracked_dictionary.cc b/components/test_runner/tracked_dictionary.cc
index 890553afcbfd25891ed42930598fd58956e38256..5b78ea0feabdd4e7867a2f22491a1355e2f9a7c8 100644
--- a/components/test_runner/tracked_dictionary.cc
+++ b/components/test_runner/tracked_dictionary.cc
@@ -41,4 +41,9 @@ void TrackedDictionary::SetBoolean(const std::string& path, bool new_value) {
   Set(path, make_scoped_ptr(new base::FundamentalValue(new_value)));
 }
 
+void TrackedDictionary::SetString(const std::string& path,
+                                  const std::string& new_value) {
+  Set(path, make_scoped_ptr(new base::StringValue(new_value)));
+}
+
 }  // namespace test_runner