Remove OwnPtr from Blink.

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

Index: third_party/WebKit/Source/core/dom/DocumentTest.cpp
diff --git a/third_party/WebKit/Source/core/dom/DocumentTest.cpp b/third_party/WebKit/Source/core/dom/DocumentTest.cpp
index d1559700d779645d1ca86041067b5486dac00cb9..f4cab42eaa3f5c5c49a0739ce219a5add123a87a 100644
--- a/third_party/WebKit/Source/core/dom/DocumentTest.cpp
+++ b/third_party/WebKit/Source/core/dom/DocumentTest.cpp
@@ -40,6 +40,7 @@
 #include "platform/weborigin/SecurityOrigin.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include <memory>
 
 namespace blink {
 
@@ -58,7 +59,7 @@ protected:
     void setHtmlInnerHTML(const char*);
 
 private:
-    OwnPtr<DummyPageHolder> m_dummyPageHolder;
+    std::unique_ptr<DummyPageHolder> m_dummyPageHolder;
 };
 
 void DocumentTest::SetUp()