cc: Move TextureMailbox::ReleaseCallback to SingleReleaseCallback.

cc/resources/texture_mailbox_deleter_unittest.cc

Index: cc/resources/texture_mailbox_deleter_unittest.cc
diff --git a/cc/resources/texture_mailbox_deleter_unittest.cc b/cc/resources/texture_mailbox_deleter_unittest.cc
index e08984e7583268b3a48e64e0723e3c62af7f1c5f..4e4b97e2e1f94bcbd69c623d2eb8ca5950715bb0 100644
--- a/cc/resources/texture_mailbox_deleter_unittest.cc
+++ b/cc/resources/texture_mailbox_deleter_unittest.cc
@@ -23,7 +23,7 @@ TEST(TextureMailboxDeleterTest, Destroy) {
   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());
@@ -33,6 +33,10 @@ TEST(TextureMailboxDeleterTest, Destroy) {
   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