Remove OwnPtr from Blink.

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

Index: third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.h
diff --git a/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.h b/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.h
index 3a57ab59e3d4bbd1dff028a3bce9230320b818ee..890990b545ff0eb4fb2c30cdf3a1ed6754b40fdf 100644
--- a/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.h
+++ b/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.h
@@ -9,6 +9,7 @@
 #include "core/dom/DOMTypedArray.h"
 #include "platform/heap/Handle.h"
 #include "platform/transforms/TransformationMatrix.h"
+#include <memory>
 
 namespace blink {
 
@@ -62,10 +63,10 @@ public:
 
 protected:
     // TransformationMatrix needs to be 16-byte aligned. PartitionAlloc
-    // supports 16-byte alignment but Oilpan doesn't. So we use an OwnPtr
+    // supports 16-byte alignment but Oilpan doesn't. So we use an std::unique_ptr
     // to allocate TransformationMatrix on PartitionAlloc.
     // TODO(oilpan): Oilpan should support 16-byte aligned allocations.
-    OwnPtr<TransformationMatrix> m_matrix;
+    std::unique_ptr<TransformationMatrix> m_matrix;
     bool m_is2D;
 };