remove dead code from devtools worker management

chrome/browser/devtools/devtools_target_impl.cc

Index: chrome/browser/devtools/devtools_target_impl.cc
diff --git a/chrome/browser/devtools/devtools_target_impl.cc b/chrome/browser/devtools/devtools_target_impl.cc
index 95e921847ddfb83f4b843d8e240cd0641da62d0e..a1995fb6ec3641e2c5089622c79dd9c8c092879d 100644
--- a/chrome/browser/devtools/devtools_target_impl.cc
+++ b/chrome/browser/devtools/devtools_target_impl.cc
@@ -275,12 +275,6 @@ scoped_ptr<DevToolsTargetImpl> DevToolsTargetImpl::CreateForRenderViewHost(
 }
 
 // static
-scoped_ptr<DevToolsTargetImpl> DevToolsTargetImpl::CreateForWorker(
-    const WorkerService::WorkerInfo& worker_info) {
-  return scoped_ptr<DevToolsTargetImpl>(new WorkerTarget(worker_info));
-}
-
-// static
 DevToolsTargetImpl::List DevToolsTargetImpl::EnumerateRenderViewHostTargets() {
   std::set<RenderViewHost*> tab_rvhs;
   for (TabContentsIterator it; !it.done(); it.Next())