Add a dependency from Gin to base

gin/modules/module_registry.h

Index: gin/modules/module_registry.h
diff --git a/gin/modules/module_registry.h b/gin/modules/module_registry.h
index 7cff355963725107010cdf99994ed8e85ec32bd6..96ea1496f2396cf7505f643e999e5fdbd0cbc143 100644
--- a/gin/modules/module_registry.h
+++ b/gin/modules/module_registry.h
@@ -27,6 +27,8 @@ struct PendingModule;
 //
 class ModuleRegistry : public ContextSupplement {
  public:
+  virtual ~ModuleRegistry();
+
   static ModuleRegistry* From(v8::Handle<v8::Context> context);
 
   static void RegisterGlobals(v8::Isolate* isolate,
@@ -45,7 +47,6 @@ class ModuleRegistry : public ContextSupplement {
   typedef std::list<PendingModule*> PendingModuleList;  // Owning reference.
 
   explicit ModuleRegistry(v8::Isolate* isolate);
-  virtual ~ModuleRegistry();
 
   // From ContextSupplement:
   virtual void Detach(v8::Handle<v8::Context> context) OVERRIDE;