cc: Move TextureMailbox::ReleaseCallback to SingleReleaseCallback.

cc/resources/texture_mailbox_deleter_unittest.cc

 // 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.
 
 #include "cc/resources/texture_mailbox_deleter.h"
 
 #include "cc/debug/test_context_provider.h"
 #include "cc/debug/test_web_graphics_context_3d.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 TEST(TextureMailboxDeleterTest, Destroy) {
   scoped_ptr<TextureMailboxDeleter> deleter(new TextureMailboxDeleter);
 
   scoped_refptr<TestContextProvider> context_provider =
       TestContextProvider::Create();
   context_provider->BindToCurrentThread();
 
   unsigned texture_id = context_provider->Context3d()->createTexture();
 
   EXPECT_TRUE(context_provider->HasOneRef());
   EXPECT_EQ(1u, context_provider->TestContext3d()->NumTextures());
 
-  TextureMailbox::ReleaseCallback cb =
+  ScopedReleaseCallback cb =
       deleter->GetReleaseCallback(context_provider, texture_id);
   EXPECT_FALSE(context_provider->HasOneRef());
   EXPECT_EQ(1u, context_provider->TestContext3d()->NumTextures());
 
   // When the deleter is destroyed, it immediately drops its ref on the
   // ContextProvider, and deletes the texture.
   deleter.reset();
   EXPECT_TRUE(context_provider->HasOneRef());
   EXPECT_EQ(0u, context_provider->TestContext3d()->NumTextures());
+
+  // Run the scoped release callback before destroying it, but it won't do
+  // anything.
+  cb.RunAndReset(0, false);
 }
 
 }  // namespace
 }  // namespace cc