Fix all Performance and Bug-Prone patterns in quic/core. No functional change. Not flag protected.

net/quic/core/reliable_quic_stream.cc

Index: net/quic/core/reliable_quic_stream.cc
diff --git a/net/quic/core/reliable_quic_stream.cc b/net/quic/core/reliable_quic_stream.cc
index 3f1ae0a36981f98badbfa3fd84d83ad484b6222b..ed110e2c2645e1f31ac20a7e9383b2fcaef1ff64 100644
--- a/net/quic/core/reliable_quic_stream.cc
+++ b/net/quic/core/reliable_quic_stream.cc
@@ -46,7 +46,9 @@ size_t GetReceivedFlowControlWindow(QuicSession* session) {
 ReliableQuicStream::PendingData::PendingData(
     string data_in,
     QuicAckListenerInterface* ack_listener_in)
-    : data(data_in), offset(0), ack_listener(ack_listener_in) {}
+    : data(std::move(data_in)),
+      offset(0),
+      ack_listener(ack_listener_in) {}
 
 ReliableQuicStream::PendingData::~PendingData() {}