Convert ChromeDriver to use only the JSON automation interface.

chrome/browser/automation/automation_provider_observers.h

Index: chrome/browser/automation/automation_provider_observers.h
diff --git a/chrome/browser/automation/automation_provider_observers.h b/chrome/browser/automation/automation_provider_observers.h
index 2005862a2c043a89b5ecfe864619463556a9a0fc..9fed883311c204231dda993819eec30eb23b6d57 100644
--- a/chrome/browser/automation/automation_provider_observers.h
+++ b/chrome/browser/automation/automation_provider_observers.h
@@ -1140,4 +1140,22 @@ class WaitForProcessLauncherThreadToGoIdleObserver
   DISALLOW_COPY_AND_ASSIGN(WaitForProcessLauncherThreadToGoIdleObserver);
 };
 
+// Observes the result of execution of Javascript and sends a JSON reply.
+class ExecuteJavascriptObserver : public DomOperationObserver {
+ public:
+  ExecuteJavascriptObserver(AutomationProvider* automation,
+                            IPC::Message* reply_message);
+  virtual ~ExecuteJavascriptObserver();
+
+ private:
+  // Overriden from DomOperationObserver.
+  virtual void OnDomOperationCompleted(const std::string& json);
+
+  base::WeakPtr<AutomationProvider> automation_;
+  scoped_ptr<IPC::Message> reply_message_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExecuteJavascriptObserver);
+};
+
+
 #endif  // CHROME_BROWSER_AUTOMATION_AUTOMATION_PROVIDER_OBSERVERS_H_