sync: Move all the js_* files into a js/ subdirectory.

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index 034408f28240ea5027f0f75f0a3288de6deb8067..4e8f5dad050d8573a0fa1cb022bbbd9c73d3c906 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -314,8 +314,8 @@
         '..',
       ],
       'sources': [
-        'browser/sync/js_test_util.cc',
-        'browser/sync/js_test_util.h',
+        'browser/sync/js/js_test_util.cc',
+        'browser/sync/js/js_test_util.h',
         'test/sync/null_directory_change_delegate.cc',
         'test/sync/null_directory_change_delegate.h',
         'test/sync/engine/test_directory_setter_upper.cc',
@@ -3104,9 +3104,9 @@
         'browser/sync/engine/syncproto_unittest.cc',
         'browser/sync/engine/syncapi_mock.h',
         'browser/sync/engine/verify_updates_command_unittest.cc',
-        'browser/sync/js_arg_list_unittest.cc',
-        'browser/sync/js_event_details_unittest.cc',
-        'browser/sync/js_sync_manager_observer_unittest.cc',
+        'browser/sync/js/js_arg_list_unittest.cc',
+        'browser/sync/js/js_event_details_unittest.cc',
+        'browser/sync/js/js_sync_manager_observer_unittest.cc',
         'browser/sync/notifier/cache_invalidation_packet_handler_unittest.cc',
         'browser/sync/notifier/chrome_invalidation_client_unittest.cc',
         'browser/sync/notifier/chrome_system_resources_unittest.cc',