content: Some code cleanup related to shared memory allocation.

content/child/blob_storage/webblobregistry_impl.cc

Index: content/child/blob_storage/webblobregistry_impl.cc
diff --git a/content/child/blob_storage/webblobregistry_impl.cc b/content/child/blob_storage/webblobregistry_impl.cc
index b564fd45a15123234b0a52c5c147fe9772b6af4a..a1ef5bec59a67a9dac487332357d30ed32c6d922 100644
--- a/content/child/blob_storage/webblobregistry_impl.cc
+++ b/content/child/blob_storage/webblobregistry_impl.cc
@@ -148,8 +148,7 @@ void WebBlobRegistryImpl::addDataToStream(const WebURL& url,
     size_t shared_memory_size =
         std::min(length, limits_.max_shared_memory_size);
     std::unique_ptr<base::SharedMemory> shared_memory(
-        ChildThreadImpl::AllocateSharedMemory(shared_memory_size,
-                                              sender_.get(), nullptr));
+        ChildThreadImpl::AllocateSharedMemory(shared_memory_size));
     CHECK(shared_memory.get());
     if (!shared_memory->Map(shared_memory_size))
       CHECK(false);