Remove BindStateHolder and have Bind() return a Callback<> object directly.

net/base/cookie_monster_unittest.cc

 // Copyright (c) 2011 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.
 
 #include <time.h>
 
 #include <algorithm>
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 127 matching lines @@
  private:
   bool result_;
 };
 
 class GetCookieStringCallback : public CookieCallback {
  public:
   GetCookieStringCallback() {}
   explicit GetCookieStringCallback(Thread* run_in_thread)
       : CookieCallback(run_in_thread) {}
 
-  void Run(std::string cookie) {
+  void Run(const std::string& cookie) {
     cookie_ = cookie;
     CallbackEpilogue();
   }
 
   const std::string& cookie() { return cookie_; }
 
  private:
   std::string cookie_;
 };
 
@@ skipping 3452 matching lines @@
   // Delete the cookie.
   DeleteCookie(cm, url_google_, "A");
   EXPECT_EQ("", GetCookies(cm, url_google_));
   EXPECT_EQ(4u, store->commands().size());
   EXPECT_EQ(CookieStoreCommand::REMOVE, store->commands()[3].type);
   EXPECT_EQ("A", store->commands()[3].cookie.Name());
   EXPECT_EQ("C", store->commands()[3].cookie.Value());
 }
 
 }  // namespace net