[DevTools] Remove unused messages (Chromium side)

chrome/browser/devtools/devtools_targets_ui.h

Index: chrome/browser/devtools/devtools_targets_ui.h
diff --git a/chrome/browser/devtools/devtools_targets_ui.h b/chrome/browser/devtools/devtools_targets_ui.h
index fbe96ed42f9057e0df816a3c3ca2b8cadb6a5efd..4174bd8178d638d24f5d35a23756c1c4010a4eb0 100644
--- a/chrome/browser/devtools/devtools_targets_ui.h
+++ b/chrome/browser/devtools/devtools_targets_ui.h
@@ -24,7 +24,6 @@ class DevToolsTargetsUIHandler {
  public:
   typedef base::Callback<void(const std::string&,
                               const base::ListValue&)> Callback;
-  typedef base::Callback<void(DevToolsTargetImpl*)> TargetCallback;
 
   DevToolsTargetsUIHandler(const std::string& source_id,
                            const Callback& callback);
@@ -40,8 +39,7 @@ class DevToolsTargetsUIHandler {
 
   DevToolsTargetImpl* GetTarget(const std::string& target_id);
 
-  virtual void Open(const std::string& browser_id, const std::string& url,
-                    const TargetCallback& callback);
+  virtual void Open(const std::string& browser_id, const std::string& url);
 
   virtual scoped_refptr<content::DevToolsAgentHost> GetBrowserAgentHost(
       const std::string& browser_id);