sync: Track validity of about:sync fields

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index ea0834b19841a46399c127bcca14166d370e5c55..6b1710009369cc92d1c3ccfe322a42e99a0b219f 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -2166,6 +2166,14 @@
         'browser/status_icons/status_icon_observer.h',
         'browser/status_icons/status_tray.cc',
         'browser/status_icons/status_tray.h',
+        'browser/sync/about_sync_util.cc',
+        'browser/sync/about_sync_util.h',
+        'browser/sync/backend_migrator.cc',
+        'browser/sync/backend_migrator.h',
+        'browser/sync/backend_unrecoverable_error_handler.cc',
+        'browser/sync/backend_unrecoverable_error_handler.h',
+        'browser/sync/failed_datatypes_handler.cc',
+        'browser/sync/failed_datatypes_handler.h',
         'browser/sync/glue/app_notification_data_type_controller.cc',
         'browser/sync/glue/app_notification_data_type_controller.h',
         'browser/sync/glue/autofill_data_type_controller.cc',
@@ -2179,8 +2187,8 @@
         'browser/sync/glue/bookmark_data_type_controller.h',
         'browser/sync/glue/bookmark_model_associator.cc',
         'browser/sync/glue/bookmark_model_associator.h',
-        'browser/sync/glue/bridged_sync_notifier.h',
         'browser/sync/glue/bridged_sync_notifier.cc',
+        'browser/sync/glue/bridged_sync_notifier.h',
         'browser/sync/glue/browser_thread_model_worker.cc',
         'browser/sync/glue/browser_thread_model_worker.h',
         'browser/sync/glue/change_processor.cc',
@@ -2191,8 +2199,8 @@
         'browser/sync/glue/chrome_extensions_activity_monitor.h',
         'browser/sync/glue/chrome_report_unrecoverable_error.cc',
         'browser/sync/glue/chrome_report_unrecoverable_error.h',
-        'browser/sync/glue/chrome_sync_notification_bridge.h',
         'browser/sync/glue/chrome_sync_notification_bridge.cc',
+        'browser/sync/glue/chrome_sync_notification_bridge.h',
         'browser/sync/glue/data_type_controller.cc',
         'browser/sync/glue/data_type_controller.h',
         'browser/sync/glue/data_type_error_handler.h',
@@ -2235,18 +2243,18 @@
         'browser/sync/glue/session_model_associator.h',
         'browser/sync/glue/shared_change_processor.cc',
         'browser/sync/glue/shared_change_processor.h',
-        'browser/sync/glue/shared_change_processor_ref.h',
         'browser/sync/glue/shared_change_processor_ref.cc',
-        'browser/sync/glue/synced_session.h',
-        'browser/sync/glue/synced_session.cc',
-        'browser/sync/glue/synced_window_delegate.h',
-        'browser/sync/glue/synced_window_delegate_android.cc',
+        'browser/sync/glue/shared_change_processor_ref.h',
         'browser/sync/glue/sync_backend_host.cc',
         'browser/sync/glue/sync_backend_host.h',
         'browser/sync/glue/sync_backend_registrar.cc',
         'browser/sync/glue/sync_backend_registrar.h',
+        'browser/sync/glue/synced_session.cc',
+        'browser/sync/glue/synced_session.h',
         'browser/sync/glue/synced_session_tracker.cc',
         'browser/sync/glue/synced_session_tracker.h',
+        'browser/sync/glue/synced_window_delegate.h',
+        'browser/sync/glue/synced_window_delegate_android.cc',
         'browser/sync/glue/theme_change_processor.cc',
         'browser/sync/glue/theme_change_processor.h',
         'browser/sync/glue/theme_data_type_controller.cc',
@@ -2267,19 +2275,13 @@
         'browser/sync/glue/ui_model_worker.h',
         'browser/sync/invalidations/invalidator_storage.cc',
         'browser/sync/invalidations/invalidator_storage.h',
-        'browser/sync/backend_migrator.cc',
-        'browser/sync/backend_migrator.h',
-        'browser/sync/backend_unrecoverable_error_handler.cc',
-        'browser/sync/backend_unrecoverable_error_handler.h',
-        'browser/sync/failed_datatypes_handler.cc',
-        'browser/sync/failed_datatypes_handler.h',
         'browser/sync/profile_sync_components_factory.h',
         'browser/sync/profile_sync_components_factory_impl.cc',
         'browser/sync/profile_sync_components_factory_impl.h',
-        'browser/sync/profile_sync_service_factory.cc',
-        'browser/sync/profile_sync_service_factory.h',
         'browser/sync/profile_sync_service.cc',
         'browser/sync/profile_sync_service.h',
+        'browser/sync/profile_sync_service_factory.cc',
+        'browser/sync/profile_sync_service_factory.h',
         'browser/sync/profile_sync_service_harness.cc',
         'browser/sync/profile_sync_service_harness.h',
         'browser/sync/profile_sync_service_observer.h',