Fix some net/spdy lint picks, from git cl lint.

net/spdy/platform/impl/spdy_string_utils_impl.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_SPDY_PLATFORM_IMPL_SPDY_STRING_UTILS_IMPL_H_
 #define NET_SPDY_PLATFORM_IMPL_SPDY_STRING_UTILS_IMPL_H_
 
 #include <sstream>
+#include <utility>
 
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "net/spdy/platform/api/spdy_string.h"
 
 namespace net {
 
 template <typename... Args>
 inline SpdyString SpdyStrCatImpl(const Args&... args) {
   std::ostringstream oss;
@@ skipping 17 matching lines @@
   base::StringAppendF(std::forward<const Args&>(args)...);
 }
 
 inline char SpdyHexDigitToIntImpl(char c) {
   return base::HexDigitToInt(c);
 }
 
 }  // namespace net
 
 #endif  // NET_SPDY_PLATFORM_IMPL_SPDY_STRING_UTILS_IMPL_H_