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

chrome/browser/accessibility/accessibility_extension_api.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_API_H_
 #define CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_API_H_
 #pragma once
 
 #include <string>
 
@@ skipping 39 matching lines @@
   void OnWindowOpened(const AccessibilityWindowInfo* details);
   void OnWindowClosed(const AccessibilityWindowInfo* details);
   void OnControlFocused(const AccessibilityControlInfo* details);
   void OnControlAction(const AccessibilityControlInfo* details);
   void OnTextChanged(const AccessibilityControlInfo* details);
   void OnMenuOpened(const AccessibilityMenuInfo* details);
   void OnMenuClosed(const AccessibilityMenuInfo* details);
 
   void DispatchEvent(Profile* profile,
                      const char* event_name,
-                     const std::string& json_args);
+                     base::ListValue* event_args);
 
   // Used for tracking registrations to history service notifications.
   content::NotificationRegistrar registrar_;
 
   DictionaryValue last_focused_control_dict_;
 
   bool enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionAccessibilityEventRouter);
 };
@@ skipping 18 matching lines @@
 
 // API function that returns alerts being shown on the give tab.
 class GetAlertsForTabFunction : public SyncExtensionFunction {
   virtual ~GetAlertsForTabFunction() {}
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME(
       "experimental.accessibility.getAlertsForTab")
 };
 
 #endif  // CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_API_H_