Move QuicIoVector into its own header file. No behavior change.

net/net.gypi

 # Copyright 2014 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.
 
 # This file is shared between the regular GYP build, the NaCl GYP build, and
 # the GN build. For GN support, it must have no conditionals or anything like
 # that beyond the simple one-level-deep dictionary of values.
 {
   'variables': {
     # Subset of net source files that are compiled for NaCl (net_nacl target).
@@ skipping 1030 matching lines @@
       'quic/core/quic_frame_list.cc',
       'quic/core/quic_frame_list.h',
       'quic/core/quic_framer.cc',
       'quic/core/quic_framer.h',
       'quic/core/quic_header_list.cc',
       'quic/core/quic_header_list.h',
       'quic/core/quic_headers_stream.cc',
       'quic/core/quic_headers_stream.h',
       'quic/core/quic_http_utils.cc',
       'quic/core/quic_http_utils.h',
+      'quic/core/quic_iovector.h',
       'quic/core/quic_multipath_received_packet_manager.cc',
       'quic/core/quic_multipath_received_packet_manager.h',
       'quic/core/quic_multipath_sent_packet_manager.cc',
       'quic/core/quic_multipath_sent_packet_manager.h',
       'quic/core/quic_multipath_transmissions_map.cc',
       'quic/core/quic_multipath_transmissions_map.h',
       'quic/core/quic_one_block_arena.h',
       'quic/core/quic_packet_creator.cc',
       'quic/core/quic_packet_creator.h',
       'quic/core/quic_packet_generator.cc',
@@ skipping 2238 matching lines @@
       'third_party/nist-pkits/crls/requireExplicitPolicy5subCACRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy5subsubCACRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy5subsubsubCACRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy7CACRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy7subCARE2CRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy7subsubCARE2RE4CRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy7subsubsubCARE2RE4CRL.crl',
     ],
   }
 }