test_runner: Migrate MockWebMIDIAccessor to Chromium C++ style.

content/shell/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
@@ skipping 105 matching lines @@
     "renderer/leak_detector.cc",
     "renderer/leak_detector.h",
     "renderer/shell_content_renderer_client.cc",
     "renderer/shell_content_renderer_client.h",
     "renderer/shell_render_frame_observer.cc",
     "renderer/shell_render_frame_observer.h",
     "renderer/shell_render_process_observer.cc",
     "renderer/shell_render_process_observer.h",
     "renderer/shell_render_view_observer.cc",
     "renderer/shell_render_view_observer.h",
-    "renderer/test_runner/MockWebMIDIAccessor.cpp",
-    "renderer/test_runner/MockWebMIDIAccessor.h",
     "renderer/test_runner/MockWebMediaStreamCenter.cpp",
     "renderer/test_runner/MockWebMediaStreamCenter.h",
     "renderer/test_runner/MockWebSpeechRecognizer.cpp",
     "renderer/test_runner/MockWebSpeechRecognizer.h",
     "renderer/test_runner/SpellCheckClient.cpp",
     "renderer/test_runner/SpellCheckClient.h",
     "renderer/test_runner/TestCommon.cpp",
     "renderer/test_runner/TestCommon.h",
     "renderer/test_runner/TestInterfaces.cpp",
     "renderer/test_runner/TestInterfaces.h",
@@ skipping 13 matching lines @@
     "renderer/test_runner/mock_constraints.cc",
     "renderer/test_runner/mock_constraints.h",
     "renderer/test_runner/mock_grammar_check.cc",
     "renderer/test_runner/mock_grammar_check.h",
     "renderer/test_runner/mock_screen_orientation_client.cc",
     "renderer/test_runner/mock_screen_orientation_client.h",
     "renderer/test_runner/mock_spell_check.cc",
     "renderer/test_runner/mock_spell_check.h",
     "renderer/test_runner/mock_web_audio_device.cc",
     "renderer/test_runner/mock_web_audio_device.h",
+    "renderer/test_runner/mock_web_midi_accessor.cc",
+    "renderer/test_runner/mock_web_midi_accessor.h",
     "renderer/test_runner/mock_web_push_client.cc",
     "renderer/test_runner/mock_web_push_client.h",
     "renderer/test_runner/mock_web_theme_engine.cc",
     "renderer/test_runner/mock_web_theme_engine.h",
     "renderer/test_runner/mock_web_theme_engine_mac.h",
     "renderer/test_runner/mock_web_theme_engine_mac.mm",
     "renderer/test_runner/mock_web_user_media_client.cc",
     "renderer/test_runner/mock_web_user_media_client.h",
     "renderer/test_runner/mock_webrtc_data_channel_handler.cc",
     "renderer/test_runner/mock_webrtc_data_channel_handler.h",
@@ skipping 284 matching lines @@
       "//tools/imagediff($host_toolchain)",
     ]
   }
 }
 
 } else {
   # Content shell not ready, make a dummpy to make dependency management easier.
   group("content_shell") {
   }
 }