Remove OwnPtr from Blink.

third_party/WebKit/Source/core/animation/AnimationStackTest.cpp

Index: third_party/WebKit/Source/core/animation/AnimationStackTest.cpp
diff --git a/third_party/WebKit/Source/core/animation/AnimationStackTest.cpp b/third_party/WebKit/Source/core/animation/AnimationStackTest.cpp
index bdccc72d67b26d45236e2a13eea0aa5b4fc3a4ed..c7ddd8b59a06804b91fe00590d88f4e7779db951 100644
--- a/third_party/WebKit/Source/core/animation/AnimationStackTest.cpp
+++ b/third_party/WebKit/Source/core/animation/AnimationStackTest.cpp
@@ -13,6 +13,7 @@
 #include "core/animation/animatable/AnimatableDouble.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include <memory>
 
 namespace blink {
 
@@ -79,7 +80,7 @@ protected:
         return toLegacyStyleInterpolation(interpolation).currentValue().get();
     }
 
-    OwnPtr<DummyPageHolder> pageHolder;
+    std::unique_ptr<DummyPageHolder> pageHolder;
     Persistent<Document> document;
     Persistent<AnimationTimeline> timeline;
     Persistent<Element> element;