Remove unnecessary ash/common/material_design/DEPS file.

ash_switches.h is located in ash/common/, not ash/.
ash/common/DEPS allows ash/test for .*test\.cc files.

BUG=NONE
TEST=NONE
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Review-Url: https://codereview.chromium.org/2146953003
Cr-Commit-Position: refs/heads/master@{#405363}
1 file changed