Return a unique_ptr from BinaryValue::CreateWithCopiedBuffer.

base/values.h

Index: base/values.h
diff --git a/base/values.h b/base/values.h
index f5d265fb369475baf12b264f415d742dfdf25f29..e3d60891b33ecaa91055e2b774cce15fb1e97f99 100644
--- a/base/values.h
+++ b/base/values.h
@@ -182,7 +182,8 @@ class BASE_EXPORT BinaryValue: public Value {
   // For situations where you want to keep ownership of your buffer, this
   // factory method creates a new BinaryValue by copying the contents of the
   // buffer that's passed in.
-  static BinaryValue* CreateWithCopiedBuffer(const char* buffer, size_t size);
+  static std::unique_ptr<BinaryValue> CreateWithCopiedBuffer(const char* buffer,
+                                                             size_t size);
 
   size_t GetSize() const { return size_; }