Implement safebrowsing download feedback service, enabled for dev & canary only.

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 1064 matching lines @@
         'browser/resources/print_preview/data/measurement_system.js',
         'browser/resources/print_preview/data/measurement_system_unittest.gtestjs',
         'browser/resources/print_preview/print_preview_utils.js',
         'browser/resources/print_preview/print_preview_utils_unittest.gtestjs',
         'browser/resources_util_unittest.cc',
         'browser/rlz/rlz_unittest.cc',
         'browser/safe_browsing/browser_feature_extractor_unittest.cc',
         'browser/safe_browsing/chunk_range_unittest.cc',
         'browser/safe_browsing/client_side_detection_host_unittest.cc',
         'browser/safe_browsing/client_side_detection_service_unittest.cc',
+        'browser/safe_browsing/download_feedback_service_unittest.cc',
+        'browser/safe_browsing/download_feedback_unittest.cc',
         'browser/safe_browsing/download_protection_service_unittest.cc',
         'browser/safe_browsing/local_two_phase_testserver.cc',
         'browser/safe_browsing/malware_details_unittest.cc',
         'browser/safe_browsing/ping_manager_unittest.cc',
         'browser/safe_browsing/prefix_set_unittest.cc',
         'browser/safe_browsing/protocol_manager_unittest.cc',
         'browser/safe_browsing/protocol_parser_unittest.cc',
         'browser/safe_browsing/safe_browsing_blocking_page_unittest.cc',
         'browser/safe_browsing/safe_browsing_database_unittest.cc',
         'browser/safe_browsing/safe_browsing_store_file_unittest.cc',
@@ skipping 1460 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }