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This CL adds the internet_options_handler_strings to the i18n set when
loading the proxy_settings_ui.

Bug: 743097
Change-Id: Ic5930f90d185a4f09545380de9f5af623aad626a
Reviewed-on: https://chromium-review.googlesource.com/572265Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487182}