Move cast_channel API tests to extensions_unittests suite

They don't need to run in Chrome's unit_tests

BUG=397164
TEST=extensions_unittests

Review URL: https://codereview.chromium.org/545293002

Cr-Commit-Position: refs/heads/master@{#293643}

chrome/chrome_tests_unit.gypi

@@ -533,9 +533,6 @@
         # http://crbug.com/348066. They are duplicated here because we haven't
         # extensions_unittests running in the bots yet. Until that happens,
         # they should be kept here.
-        '../extensions/browser/api/cast_channel/cast_channel_api_unittest.cc',
-        '../extensions/browser/api/cast_channel/cast_socket_unittest.cc',
-        '../extensions/browser/api/cast_channel/logger_unittest.cc',
         '../extensions/browser/api/power/power_api_unittest.cc',
         '../extensions/browser/app_window/app_window_geometry_cache_unittest.cc',
         '../extensions/browser/error_map_unittest.cc',

extensions/extensions.gyp

@@ -985,6 +985,7 @@
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
+        'cast_channel_proto',
         'extensions_common',
         'extensions_renderer',
         'extensions_resources.gyp:extensions_resources',
@@ -999,6 +1000,9 @@
       'sources': [
         'browser/api/api_resource_manager_unittest.cc',
         'browser/api/bluetooth/bluetooth_event_router_unittest.cc',
+        'browser/api/cast_channel/cast_channel_api_unittest.cc',
+        'browser/api/cast_channel/cast_socket_unittest.cc',
+        'browser/api/cast_channel/logger_unittest.cc',
         'browser/api/declarative/deduping_factory_unittest.cc',
         'browser/api/sockets_tcp/sockets_tcp_api_unittest.cc',
         'browser/api/storage/settings_quota_unittest.cc',