Revert "Reland: Use "gfxstream" namespace" Revert submission 2513870-gfxstream-namespace-2 Reason for revert: This breaks the MacOS gfxstream build. Reverted changes: /q/submissionid:2513870-gfxstream-namespace-2 Bug: 276321260 Change-Id: I58544dcdca7f33db4b1cce9ffd57e56508a8182c