Don't use deprecated ListValue::Append(Value*) overload.

net/log/net_log.h

Index: net/log/net_log.h
diff --git a/net/log/net_log.h b/net/log/net_log.h
index 190b794bc152f5e156c35a450ba6e1e9db1ccb8e..aeb845a9a6c19c485af082be015bf2acc208ab16 100644
--- a/net/log/net_log.h
+++ b/net/log/net_log.h
@@ -132,12 +132,11 @@ class NET_EXPORT NetLog {
     EventPhase phase() const { return data_->phase; }
 
     // Serializes the specified event to a Value.  The Value also includes the
-    // current time.  Caller takes ownership of returned Value.  Takes in a time
-    // to allow back-dating entries.
-    base::Value* ToValue() const;
+    // current time.  Takes in a time to allow back-dating entries.
+    std::unique_ptr<base::Value> ToValue() const;
 
     // Returns the parameters as a Value.  Returns NULL if there are no
-    // parameters.  Caller takes ownership of returned Value.
+    // parameters.
     std::unique_ptr<base::Value> ParametersToValue() const;
 
    private: