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This adds restrictions to //aw/gpu and ensures only //aw/browser can
depend on network_service.h. Other than these tweaks, the DEPS files
were in pretty good shape as-is and already enforced the main rules.

Bug: 934152
Change-Id: Id532610dd125e142a7796caeb605a1e50b2287a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954543Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722555}