remove dead code from devtools worker management

chrome/browser/devtools/devtools_target_impl.h

Index: chrome/browser/devtools/devtools_target_impl.h
diff --git a/chrome/browser/devtools/devtools_target_impl.h b/chrome/browser/devtools/devtools_target_impl.h
index d02be13dea49d89e1bff10e1b9c5b8a71e7aefa0..b17f3006c6931d75b89b401b75c30349b09a1bb7 100644
--- a/chrome/browser/devtools/devtools_target_impl.h
+++ b/chrome/browser/devtools/devtools_target_impl.h
@@ -59,10 +59,6 @@ class DevToolsTargetImpl : public content::DevToolsTarget {
   static scoped_ptr<DevToolsTargetImpl> CreateForRenderViewHost(
       content::RenderViewHost*, bool is_tab);
 
-  // Creates a new target associated with a shared worker.
-  static scoped_ptr<DevToolsTargetImpl> CreateForWorker(
-      const content::WorkerService::WorkerInfo&);
-
   typedef std::vector<DevToolsTargetImpl*> List;
   typedef base::Callback<void(const List&)> Callback;