Add a build flag to configure bundling of HSTS preload list

net/http/transport_security_state_static_unittest.template

 // 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.
 
 // This file is generated by net/tools/transport_security_state_generator/.
 // See transport_security_state_static.template for more information on the data
 // in this file.
 
 #include <stdint.h>
 
 #include "net/http/transport_security_state_source.h"
 
 [[SPKI_HASHES]]
 
 static const char* const kExpectCTReportURIs[] = [[EXPECT_CT_REPORT_URIS]];
 
 static const char* const kExpectStapleReportURIs[] = [[EXPECT_STAPLE_REPORT_URIS]];
 
 static const char* const kNoRejectedPublicKeys[] = {
     NULL,
 };
 
-static const char kNoReportURI[] = "";
-
 [[ACCEPTABLE_CERTS]]
 
 static const struct net::TransportSecurityStateSource::Pinset kPinsets[] = [[PINSETS]];
 
 static const uint8_t kHSTSHuffmanTree[] = [[HUFFMAN_TREE]];
 
 static const uint8_t kPreloadedHSTSData[] = [[HSTS_TRIE]];
 
 static const unsigned kPreloadedHSTSBits = [[HSTS_TRIE_BITS]];
 static const unsigned kHSTSRootPosition = [[HSTS_TRIE_ROOT]];
 
 static const net::TransportSecurityStateSource kHSTSSource = {
   kHSTSHuffmanTree,
   sizeof(kHSTSHuffmanTree),
   kPreloadedHSTSData,
   kPreloadedHSTSBits,
   kHSTSRootPosition,
   kExpectCTReportURIs,
   kExpectStapleReportURIs,
   kPinsets,
   arraysize(kPinsets)
 };