Remove TransportDIB methods from RenderProcess(Host)

content/browser/renderer_host/render_widget_helper.cc

Index: content/browser/renderer_host/render_widget_helper.cc
diff --git a/content/browser/renderer_host/render_widget_helper.cc b/content/browser/renderer_host/render_widget_helper.cc
index 2d3d3ccd20ff559f313519799bfe6b07f3604fc5..169347f3288462bd4de534d0b12c464ed16ebf70 100644
--- a/content/browser/renderer_host/render_widget_helper.cc
+++ b/content/browser/renderer_host/render_widget_helper.cc
@@ -343,18 +343,6 @@ void RenderWidgetHelper::OnCreateFullscreenWidgetOnUI(int opener_id,
 }
 
 #if defined(OS_POSIX) && !defined(OS_ANDROID)
-TransportDIB* RenderWidgetHelper::MapTransportDIB(TransportDIB::Id dib_id) {
-  base::AutoLock locked(allocated_dibs_lock_);
-
-  const std::map<TransportDIB::Id, int>::iterator
-      i = allocated_dibs_.find(dib_id);
-  if (i == allocated_dibs_.end())
-    return NULL;
-
-  base::FileDescriptor fd(dup(i->second), true);
-  return TransportDIB::Map(fd);
-}
-
 void RenderWidgetHelper::AllocTransportDIB(uint32 size,
                                            bool cache_in_browser,
                                            TransportDIB::Handle* result) {