Replace scoped_ptr with unique_ptr in webrtc/base/

webrtc/base/natsocketfactory.cc

Index: webrtc/base/natsocketfactory.cc
diff --git a/webrtc/base/natsocketfactory.cc b/webrtc/base/natsocketfactory.cc
index 0abd2a1b056d80b600a667cabbb59b4637e0a2e8..985748cff9034b32d476e7f1c0a9c61a68fbdab6 100644
--- a/webrtc/base/natsocketfactory.cc
+++ b/webrtc/base/natsocketfactory.cc
@@ -141,7 +141,7 @@ class NATSocket : public AsyncSocket, public sigslot::has_slots<> {
       return socket_->SendTo(data, size, addr);
     }
     // This array will be too large for IPv4 packets, but only by 12 bytes.
-    scoped_ptr<char[]> buf(new char[size + kNATEncodedIPv6AddressSize]);
+    std::unique_ptr<char[]> buf(new char[size + kNATEncodedIPv6AddressSize]);
     size_t addrlength = PackAddressForNAT(buf.get(),
                                           size + kNATEncodedIPv6AddressSize,
                                           addr);