Android: Do not build any extensions code except for extensions_constants.

chrome/chrome_tests_unit.gypi

Index: chrome/chrome_tests_unit.gypi
diff --git a/chrome/chrome_tests_unit.gypi b/chrome/chrome_tests_unit.gypi
index 117c2098bccb49e9c0ebc8aca84de22d59ecb59a..598b619cb66158307f786186a723a960920a401b 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -1532,8 +1532,6 @@
         'browser/download/download_test_file_activity_observer.h',
         'browser/download/test_download_shelf.cc',
         'browser/download/test_download_shelf.h',
-        'browser/extensions/extension_action_test_util.cc',
-        'browser/extensions/extension_action_test_util.h',
         'browser/invalidation/fake_invalidation_service.cc',
         'browser/invalidation/fake_invalidation_service.h',
         'browser/media/fake_desktop_media_list.cc',
@@ -1597,8 +1595,6 @@
         'browser/ui/views/find_bar_host_unittest_util_views.cc',
         'browser/ui/website_settings/mock_permission_bubble_request.cc',
         'browser/ui/website_settings/mock_permission_bubble_request.h',
-        'common/extensions/extension_test_util.cc',
-        'common/extensions/extension_test_util.h',
         'renderer/chrome_mock_render_thread.cc',
         'renderer/chrome_mock_render_thread.h',
         'renderer/safe_browsing/mock_feature_extractor_clock.cc',
@@ -1800,6 +1796,8 @@
             'browser/drive/test_util.h',
             'browser/extensions/api/messaging/native_messaging_test_util.cc',
             'browser/extensions/api/messaging/native_messaging_test_util.h',
+            'browser/extensions/extension_action_test_util.cc',
+            'browser/extensions/extension_action_test_util.h',
             'browser/extensions/extension_notification_observer.cc',
             'browser/extensions/extension_notification_observer.h',
             'browser/extensions/mock_extension_special_storage_policy.cc',
@@ -1818,6 +1816,8 @@
             'browser/extensions/test_extension_system.h',
             'browser/media_galleries/media_galleries_test_util.cc',
             'browser/media_galleries/media_galleries_test_util.h',
+            'common/extensions/extension_test_util.cc',
+            'common/extensions/extension_test_util.h',
           ],
         }],
         ['OS=="win"', {
@@ -2057,6 +2057,7 @@
             ['exclude', '^browser/extensions/'],
             ['exclude', '^browser/sync/glue/extensions_activity_monitor_unittest.cc'],
             ['exclude', '^browser/sync_file_system/'],
+            ['exclude', '^browser/web_applications/'],
             ['exclude', '^common/extensions/'],
             ['exclude', '^utility/extensions/'],
             ['exclude', '^utility/image_writer/'],