Remove OwnPtr from Blink.

third_party/WebKit/Source/core/editing/SurroundingTextTest.cpp

Index: third_party/WebKit/Source/core/editing/SurroundingTextTest.cpp
diff --git a/third_party/WebKit/Source/core/editing/SurroundingTextTest.cpp b/third_party/WebKit/Source/core/editing/SurroundingTextTest.cpp
index 3a9b2c942e8e9a2812977adf95e2acb6b92f70ae..46ceeac955cc1f7726d48eb3444810ea717d996c 100644
--- a/third_party/WebKit/Source/core/editing/SurroundingTextTest.cpp
+++ b/third_party/WebKit/Source/core/editing/SurroundingTextTest.cpp
@@ -12,6 +12,7 @@
 #include "core/html/HTMLElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include <memory>
 
 namespace blink {
 
@@ -25,7 +26,7 @@ protected:
 private:
     void SetUp() override;
 
-    OwnPtr<DummyPageHolder> m_dummyPageHolder;
+    std::unique_ptr<DummyPageHolder> m_dummyPageHolder;
 };
 
 void SurroundingTextTest::SetUp()