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Fixes warnings in the msvs-gyp generator.

This is a followup to
https://codereview.chromium.org/615893003 (gesture_event_type_list.h,
    popup_item_type_list.h, result_codes_list.h and
    top_controls_state_list.h)
https://codereview.chromium.org/861373002 (navigator_connect_service.h and
    navigator_connect_servive_factory.h)
https://codereview.chromium.org/865413002 (layer_tree_build_helper.h)
https://codereview.chromium.org/774573003 (platform_notification_service.h)

R=jam@chromium.org,avi@chromium.org,mek@chromium.org,dtrainor@chromium.org,changwan@chromium.org,peter@chromium.org
BUG=459058,405532,351558,426458,451313,439950

Review URL: https://codereview.chromium.org/952443004

Cr-Commit-Position: refs/heads/master@{#317617}