Remove OwnPtr from Blink.

third_party/WebKit/Source/core/dom/NthIndexCacheTest.cpp

Index: third_party/WebKit/Source/core/dom/NthIndexCacheTest.cpp
diff --git a/third_party/WebKit/Source/core/dom/NthIndexCacheTest.cpp b/third_party/WebKit/Source/core/dom/NthIndexCacheTest.cpp
index fe24da84b7fa65ef9f6fdc7119c71c63479ba957..3a0b7500f50f9653527753d84ff1db7027b3397c 100644
--- a/third_party/WebKit/Source/core/dom/NthIndexCacheTest.cpp
+++ b/third_party/WebKit/Source/core/dom/NthIndexCacheTest.cpp
@@ -8,6 +8,7 @@
 #include "core/html/HTMLElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include <memory>
 
 namespace blink {
 
@@ -19,7 +20,7 @@ protected:
     void setHtmlInnerHTML(const char* htmlContent);
 
 private:
-    OwnPtr<DummyPageHolder> m_dummyPageHolder;
+    std::unique_ptr<DummyPageHolder> m_dummyPageHolder;
 };
 
 void NthIndexCacheTest::SetUp()