Chromium doesn't use the device managment code in webrtc/media so we need a way to turn it off in order to eliminate Chromium's src/third_party/libjingle/libjingle.gyp BUG=webrtc:4256 NOTRY=True TESTED=Trybots + successfully compiled with GYP_DEFINES=include_internal_device_management=0 webrtc/build/gyp_webrtc ninja -C out/Debug rtc_media Review URL: https://codereview.webrtc.org/1693803002 Cr-Commit-Position: refs/heads/master@{#11816}