Remove the native_theme dependency from blimp_common.
Remove the native_theme dependency from blimp_common.

The Blimp client directly imports the native_theme_switches dependency, so
having the additional dependency in common leads to symbol conflicts in the
blimp_client build.

BUG=553633

Review URL: https://codereview.chromium.org/1408123015

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#359012}

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