Refactoring: de-couple Extensions from "script injection System" [render side]:4

extensions/common/extension_set.cc

Index: extensions/common/extension_set.cc
diff --git a/extensions/common/extension_set.cc b/extensions/common/extension_set.cc
index c4c15d4e1f2bc3b8f291f590f7be0b109a21583e..fe3e4dff227b40fe5f682421bb8cddcc37348e98 100644
--- a/extensions/common/extension_set.cc
+++ b/extensions/common/extension_set.cc
@@ -9,6 +9,7 @@
 #include "base/stl_util.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
+#include "extensions/common/host_id.h"
 #include "extensions/common/manifest_handlers/sandboxed_page_info.h"
 
 namespace extensions {
@@ -138,6 +139,14 @@ ExtensionIdSet ExtensionSet::GetIDs() const {
   return ids;
 }
 
+std::set<HostID> ExtensionSet::GetHostIDs() const {
+  std::set<HostID> ids;
+  for (ExtensionMap::const_iterator it = extensions_.begin();
+       it != extensions_.end(); ++it) {
+    ids.insert(HostID(HostID::EXTENSIONS, it->first));
+  }
+  return ids;
+}
 bool ExtensionSet::ExtensionBindingsAllowed(const GURL& url) const {
   if (url.SchemeIs(kExtensionScheme))
     return true;