Remove OwnPtr from Blink.

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

Index: third_party/WebKit/Source/core/dom/StyleEngine.h
diff --git a/third_party/WebKit/Source/core/dom/StyleEngine.h b/third_party/WebKit/Source/core/dom/StyleEngine.h
index 24dfe5766b3abc3ed3cdee45b2b42a532e610fbf..b2cd4f001e62058521b5bf47f194b1a75b249b07 100644
--- a/third_party/WebKit/Source/core/dom/StyleEngine.h
+++ b/third_party/WebKit/Source/core/dom/StyleEngine.h
@@ -43,6 +43,7 @@
 #include "wtf/TemporaryChange.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
+#include <memory>
 
 namespace blink {
 
@@ -261,7 +262,7 @@ private:
     HeapHashMap<AtomicString, Member<StyleSheetContents>> m_textToSheetCache;
     HeapHashMap<Member<StyleSheetContents>, AtomicString> m_sheetToTextCache;
 
-    OwnPtr<StyleResolverStats> m_styleResolverStats;
+    std::unique_ptr<StyleResolverStats> m_styleResolverStats;
     unsigned m_styleForElementCount = 0;
 
     friend class StyleEngineTest;