Use scoped_ptr::Pass instead of scoped_ptr::PassAs<T>.

net/disk_cache/memory/mem_backend_impl.cc

Index: net/disk_cache/memory/mem_backend_impl.cc
diff --git a/net/disk_cache/memory/mem_backend_impl.cc b/net/disk_cache/memory/mem_backend_impl.cc
index 3a9007539e139c9736c0778ce4cd5c1266535f14..046623fc819b6def3330a0baabc83579a5ffae3e 100644
--- a/net/disk_cache/memory/mem_backend_impl.cc
+++ b/net/disk_cache/memory/mem_backend_impl.cc
@@ -47,10 +47,10 @@ scoped_ptr<Backend> MemBackendImpl::CreateBackend(int max_bytes,
   scoped_ptr<MemBackendImpl> cache(new MemBackendImpl(net_log));
   cache->SetMaxSize(max_bytes);
   if (cache->Init())
-    return cache.PassAs<Backend>();
+    return cache.Pass();
 
   LOG(ERROR) << "Unable to create cache";
-  return scoped_ptr<Backend>();
+  return nullptr;
 }
 
 bool MemBackendImpl::Init() {