Remove OwnPtr from Blink.

third_party/WebKit/Source/core/dom/AXObjectCache.h

Index: third_party/WebKit/Source/core/dom/AXObjectCache.h
diff --git a/third_party/WebKit/Source/core/dom/AXObjectCache.h b/third_party/WebKit/Source/core/dom/AXObjectCache.h
index be51633e666f095c81d78d5772da2ae4e2a27ce1..21c2541667a0ed371825671f777926b903e3ab85 100644
--- a/third_party/WebKit/Source/core/dom/AXObjectCache.h
+++ b/third_party/WebKit/Source/core/dom/AXObjectCache.h
@@ -28,6 +28,7 @@
 
 #include "core/CoreExport.h"
 #include "core/dom/Document.h"
+#include <memory>
 
 typedef unsigned AXID;
 
@@ -154,7 +155,7 @@ class CORE_EXPORT ScopedAXObjectCache {
     USING_FAST_MALLOC(ScopedAXObjectCache);
     WTF_MAKE_NONCOPYABLE(ScopedAXObjectCache);
 public:
-    static PassOwnPtr<ScopedAXObjectCache> create(Document&);
+    static std::unique_ptr<ScopedAXObjectCache> create(Document&);
     ~ScopedAXObjectCache();
 
     AXObjectCache* get();