Allow constructing {Interface,Struct}Ptr from nullptr

mojo/public/cpp/bindings/lib/filter_chain.cc

Index: mojo/public/cpp/bindings/lib/filter_chain.cc
diff --git a/mojo/public/cpp/bindings/lib/filter_chain.cc b/mojo/public/cpp/bindings/lib/filter_chain.cc
index 663456218498082e6f85047ce6f9b4904574c11d..d32eb7860896e3d670c3075310d57f4276092a89 100644
--- a/mojo/public/cpp/bindings/lib/filter_chain.cc
+++ b/mojo/public/cpp/bindings/lib/filter_chain.cc
@@ -14,14 +14,14 @@ namespace internal {
 FilterChain::FilterChain(MessageReceiver* sink) : sink_(sink) {
 }
 
-FilterChain::FilterChain(RValue other) : sink_(other.object->sink_) {
-  other.object->sink_ = nullptr;
-  filters_.swap(other.object->filters_);
+FilterChain::FilterChain(FilterChain&& other) : sink_(other.sink_) {
+  other.sink_ = nullptr;
+  filters_.swap(other.filters_);
 }
 
-FilterChain& FilterChain::operator=(RValue other) {
-  std::swap(sink_, other.object->sink_);
-  filters_.swap(other.object->filters_);
+FilterChain& FilterChain::operator=(FilterChain&& other) {
+  std::swap(sink_, other.sink_);
+  filters_.swap(other.filters_);
   return *this;
 }