Remove ref to toolbar_model_security_level_list.h
Remove ref to toolbar_model_security_level_list.h

The file toolbar_model_security_level_list.h was deleted with
https://codereview.chromium.org/659493003
dfdc7fb2bcde7ea4a9458967fdc5f7fa15abb3fa
but was not removed from chrome/chrome_browser_ui.gypi. This file is
no longer present or referenced asside from this location.

Review URL: https://codereview.chromium.org/1155293002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#331466}

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