The optional Malware Details also collects HTTP cache information. See design...

chrome/chrome_browser.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': '<(library)',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 1709 matching lines @@
         'browser/safe_browsing/chunk_range.cc',
         'browser/safe_browsing/chunk_range.h',
         'browser/safe_browsing/client_side_detection_host.cc',
         'browser/safe_browsing/client_side_detection_host.h',
         'browser/safe_browsing/client_side_detection_service.cc',
         'browser/safe_browsing/client_side_detection_service.h',
         '<(protoc_out_dir)/chrome/browser/safe_browsing/csd.pb.cc',
         '<(protoc_out_dir)/chrome/browser/safe_browsing/csd.pb.h',
         'browser/safe_browsing/malware_details.cc',
         'browser/safe_browsing/malware_details.h',
+        'browser/safe_browsing/malware_details_cache.cc',
+        'browser/safe_browsing/malware_details_cache.h',
         'browser/safe_browsing/prefix_set.cc',
         'browser/safe_browsing/prefix_set.h',
         'browser/safe_browsing/protocol_manager.cc',
         'browser/safe_browsing/protocol_manager.h',
         'browser/safe_browsing/protocol_parser.cc',
         'browser/safe_browsing/protocol_parser.h',
         '<(protoc_out_dir)/chrome/browser/safe_browsing/report.pb.cc',
         '<(protoc_out_dir)/chrome/browser/safe_browsing/report.pb.h',
         'browser/safe_browsing/safe_browsing_blocking_page.cc',
         'browser/safe_browsing/safe_browsing_blocking_page.h',
@@ skipping 2679 matching lines @@
       'hard_dependency': 1,
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: