Add a dependency from Gin to base

gin/modules/module_registry.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GIN_MODULES_MODULE_REGISTRY_H_
 #define GIN_MODULES_MODULE_REGISTRY_H_
 
 #include <list>
 #include <string>
 #include "base/compiler_specific.h"
 #include "gin/per_context_data.h"
 
 namespace gin {
 
 struct PendingModule;
 
 // This class implements the Asynchronous Module Definition (AMD) API.
 // https://github.com/amdjs/amdjs-api/wiki/AMD
 //
 // Our implementation isn't complete yet. Missing features:
 //   1) Built-in support for require, exports, and module.
 //   2) Path resoltuion in module names.
 //
 // For these reasons, we don't have an "amd" property on the "define"
 // function. The spec says we should only add that property once our
 // implementation complies with the specification.
 //
 class ModuleRegistry : public ContextSupplement {
  public:
+  virtual ~ModuleRegistry();
+
   static ModuleRegistry* From(v8::Handle<v8::Context> context);
 
   static void RegisterGlobals(v8::Isolate* isolate,
                               v8::Handle<v8::ObjectTemplate> templ);
 
   // The caller must have already entered our context.
   void AddBuiltinModule(v8::Isolate* isolate,
                         const std::string& id,
                         v8::Handle<v8::ObjectTemplate> templ);
 
   // Takes ownership of |pending|. The caller must have already entered
   // our context.
   void AddPendingModule(v8::Isolate* isolate, PendingModule* pending);
 
  private:
   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;
 
   // Takes ownership of |pending|.
   bool AttemptToLoad(v8::Isolate* isolate, PendingModule* pending);
   void AttemptToLoadPendingModules(v8::Isolate* isolate);
 
   v8::Persistent<v8::Object> modules_;
   PendingModuleList pending_modules_;
 
   DISALLOW_COPY_AND_ASSIGN(ModuleRegistry);
 };
 
 }  // namespace gin
 
 #endif  // GIN_MODULES_MODULE_REGISTRY_H_