Refactor extension event distribution to use Values instead of JSON strings.

chrome/browser/speech/extension_api/tts_extension_api_controller.cc

Index: chrome/browser/speech/extension_api/tts_extension_api_controller.cc
diff --git a/chrome/browser/speech/extension_api/tts_extension_api_controller.cc b/chrome/browser/speech/extension_api/tts_extension_api_controller.cc
index 0d2067440f2090ab5e6e772601f0d4710fec22a7..29e42f93471833aea8b4d5263755070d7b7fc19d 100644
--- a/chrome/browser/speech/extension_api/tts_extension_api_controller.cc
+++ b/chrome/browser/speech/extension_api/tts_extension_api_controller.cc
@@ -108,7 +108,6 @@ void Utterance::OnTtsEvent(TtsEventType event_type,
   if (src_id_ < 0)
     return;
 
-  ListValue args;
   DictionaryValue* event = new DictionaryValue();
   if (char_index != kInvalidCharIndex)
     event->SetInteger(constants::kCharIndexKey, char_index);
@@ -118,14 +117,14 @@ void Utterance::OnTtsEvent(TtsEventType event_type,
   }
   event->SetInteger(constants::kSrcIdKey, src_id_);
   event->SetBoolean(constants::kIsFinalEventKey, finished_);
-  args.Set(0, event);
-  std::string json_args;
-  base::JSONWriter::Write(&args, &json_args);
+
+  ListValue* arguments = new ListValue();
+  arguments->Set(0, event);
 
   profile_->GetExtensionEventRouter()->DispatchEventToExtension(
       src_extension_id_,
       events::kOnEvent,
-      json_args,
+      arguments,
       profile_,
       src_url_);
 }