MidiPermissionContext::GetPermission() returns BLOCK for insecure origins.

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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       '../components/autofill/content/renderer/test_password_autofill_agent.cc',
       '../components/autofill/content/renderer/test_password_autofill_agent.h',
       '../components/autofill/content/renderer/test_password_generation_agent.cc',
       '../components/autofill/content/renderer/test_password_generation_agent.h',
@@ skipping 109 matching lines @@
       'browser/install_verification/win/module_list_unittest.cc',
       'browser/install_verification/win/module_verification_test.cc',
       'browser/install_verification/win/module_verification_test.h',
       'browser/internal_auth_unittest.cc',
       'browser/invalidation/invalidator_storage_unittest.cc',
       'browser/io_thread_unittest.cc',
       'browser/logging_chrome_unittest.cc',
       'browser/mac/keystone_glue_unittest.mm',
       'browser/manifest/manifest_icon_selector_unittest.cc',
       'browser/media/native_desktop_media_list_unittest.cc',
+      'browser/media/midi_permission_context_unittest.cc',
       'browser/metrics/chrome_metrics_service_accessor_unittest.cc',
       'browser/metrics/cloned_install_detector_unittest.cc',
       'browser/metrics/drive_metrics_provider_unittest.cc',
       'browser/metrics/signin_status_metrics_provider_chromeos_unittest.cc',
       'browser/metrics/signin_status_metrics_provider_unittest.cc',
       'browser/metrics/thread_watcher_android_unittest.cc',
       'browser/metrics/thread_watcher_unittest.cc',
       'browser/metrics/time_ticks_experiment_unittest.cc',
       'browser/metrics/variations/generated_resources_map_lookup_unittest.cc',
       'browser/metrics/variations/variations_request_scheduler_mobile_unittest.cc',
@@ skipping 1952 matching lines @@
       'sources': [
         'browser/sync/glue/session_sync_test_helper.cc',
         'browser/sync/glue/session_sync_test_helper.h',
         'test/base/run_all_unittests.cc',
       ],
       'conditions': [
         ['enable_media_router==1', {
           'dependencies': [
             'browser/media/router/media_router.gyp:media_router_test_support',
           ],
-        }],         
+        }],
       ],
     },
     {
       # GN version: //chrome/test:unit_tests
       'target_name': 'unit_tests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         # NOTE: New dependencies should generally be added in the OS!="ios"
         # dependencies block below, rather than here.
         # Unit tests should only depend on:
@@ skipping 711 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }