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

chrome/browser/speech/extension_api/tts_engine_extension_api.cc

Index: chrome/browser/speech/extension_api/tts_engine_extension_api.cc
diff --git a/chrome/browser/speech/extension_api/tts_engine_extension_api.cc b/chrome/browser/speech/extension_api/tts_engine_extension_api.cc
index 711880e877b94adef62980c433fe28ad3a0ec1ad..58af2adadc173fb235b86275a86df3ebe822f9f8 100644
--- a/chrome/browser/speech/extension_api/tts_engine_extension_api.cc
+++ b/chrome/browser/speech/extension_api/tts_engine_extension_api.cc
@@ -188,8 +188,8 @@ void ExtensionTtsEngineSpeak(Utterance* utterance,
   bool sends_end_event =
       (event_types.find(constants::kEventTypeEnd) != event_types.end());
 
-  ListValue args;
-  args.Set(0, Value::CreateStringValue(utterance->text()));
+  ListValue* args = new ListValue();
+  args->Set(0, Value::CreateStringValue(utterance->text()));
 
   // Pass through most options to the speech engine, but remove some
   // that are handled internally.
@@ -208,15 +208,13 @@ void ExtensionTtsEngineSpeak(Utterance* utterance,
   if (options->HasKey(constants::kOnEventKey))
     options->Remove(constants::kOnEventKey, NULL);
 
-  args.Set(1, options);
-  args.Set(2, Value::CreateIntegerValue(utterance->id()));
-  std::string json_args;
-  base::JSONWriter::Write(&args, &json_args);
+  args->Set(1, options);
+  args->Set(2, Value::CreateIntegerValue(utterance->id()));
 
   utterance->profile()->GetExtensionEventRouter()->DispatchEventToExtension(
       extension->id(),
       events::kOnSpeak,
-      json_args,
+      args,
       utterance->profile(),
       GURL());
 }
@@ -225,7 +223,7 @@ void ExtensionTtsEngineStop(Utterance* utterance) {
   utterance->profile()->GetExtensionEventRouter()->DispatchEventToExtension(
       utterance->extension_id(),
       events::kOnStop,
-      "[]",
+      NULL,
       utterance->profile(),
       GURL());
 }