Made PassRefPtr move only and replaced new copies with moves.

third_party/WebKit/Source/core/css/PropertyRegistry.cpp

Index: third_party/WebKit/Source/core/css/PropertyRegistry.cpp
diff --git a/third_party/WebKit/Source/core/css/PropertyRegistry.cpp b/third_party/WebKit/Source/core/css/PropertyRegistry.cpp
index fb0229591a5069f5e2916396aa1767fb695c0466..692232579de7c78805ccfe5b57b579e1100ffe23 100644
--- a/third_party/WebKit/Source/core/css/PropertyRegistry.cpp
+++ b/third_party/WebKit/Source/core/css/PropertyRegistry.cpp
@@ -13,8 +13,8 @@ void PropertyRegistry::registerProperty(
     const CSSValue* initial,
     PassRefPtr<CSSVariableData> initialVariableData) {
   DCHECK(!registration(name));
-  m_registrations.set(
-      name, new Registration(syntax, inherits, initial, initialVariableData));
+  m_registrations.set(name, new Registration(syntax, inherits, initial,
+                                             std::move(initialVariableData)));
 }
 
 const PropertyRegistry::Registration* PropertyRegistry::registration(