Remove std::move from return statements.

net/quic/platform/impl/quic_str_cat_impl.h

Index: net/quic/platform/impl/quic_str_cat_impl.h
diff --git a/net/quic/platform/impl/quic_str_cat_impl.h b/net/quic/platform/impl/quic_str_cat_impl.h
index 3e07d64cbbc27674cc23611546371ddd7ac5fdfc..fae149d3cc88d1d3353e98b906e94a239d9d8bd8 100644
--- a/net/quic/platform/impl/quic_str_cat_impl.h
+++ b/net/quic/platform/impl/quic_str_cat_impl.h
@@ -22,7 +22,7 @@ inline std::string QuicStrCatImpl(const Args&... args) {
 
 template <typename... Args>
 inline std::string QuicStringPrintfImpl(const Args&... args) {
-  return std::move(base::StringPrintf(std::forward<const Args&>(args)...));
+  return base::StringPrintf(std::forward<const Args&>(args)...);
 }
 
 }  // namespace net