Convert the PluginService interface to be an async wrapper around PluginList.

chrome/browser/automation/testing_automation_provider.h

Index: chrome/browser/automation/testing_automation_provider.h
diff --git a/chrome/browser/automation/testing_automation_provider.h b/chrome/browser/automation/testing_automation_provider.h
index 06a2b1a3557d56dee7fe6e89bd4acf40ebfd536a..8edf99e12b795fbb6efe4cbc7610419df56b2987 100644
--- a/chrome/browser/automation/testing_automation_provider.h
+++ b/chrome/browser/automation/testing_automation_provider.h
@@ -28,6 +28,10 @@ namespace base {
 class DictionaryValue;
 }
 
+namespace webkit {
+struct WebPluginInfo;
+}
+
 // This is an automation provider containing testing calls.
 class TestingAutomationProvider : public AutomationProvider,
                                   public BrowserList::Observer,
@@ -492,6 +496,10 @@ class TestingAutomationProvider : public AutomationProvider,
   void GetPluginsInfo(Browser* browser,
                       base::DictionaryValue* args,
                       IPC::Message* reply_message);
+  void GetPluginsInfoCallback(Browser* browser,
+      base::DictionaryValue* args,
+      IPC::Message* reply_message,
+      const std::vector<webkit::WebPluginInfo>& plugins);
 
   // Enable a plugin.
   // Uses the JSON interface for input/output.