directives in our DEPS files are not needed anymore. Includes from webrtc/rtc_base are also whitelisted in webrtc/DEPS so we don't have to whitelist it in all the others DEPS files. BUG=webrtc:7634 NOTRY=True Review-Url: https://codereview.webrtc.org/3006583002 Cr-Commit-Position: refs/heads/master@{#19601}