Remove old webrtc/base directory

webrtc/base/README.md

Index: webrtc/base/README.md
diff --git a/webrtc/base/README.md b/webrtc/base/README.md
deleted file mode 100644
index 3d0bf6695bc470b748424a67760a733f88980929..0000000000000000000000000000000000000000
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-# What?
-
-The contents of base have moved to rtc_base.
-
-# Why?
-
-We want to move all the contents in the webrtc directory to top-level, because:
-* When we migrate from Rietveld to PolyGerrit we won't be able to apply WebRTC
-patches on Chromium trybots (which is a very useful feature, especially as we
-plan to have such trybots in our default trybot set).
-This is because PolyGerrit needs the repo in Chromium to be the same as the
-WebRTC repo, otherwise it won’t be able to apply the patch.
-* To fully automate rolling into Chromium DEPS, we wish to use the LKGR finder,
-but doing so is blocked on this (needs the same revision hashes to avoid ugly
-hacks). See [this bug](http://crbug.com/666726).
-
-# Tracking Bugs
-
-[Chromium tracking bug](http://crbug.com/611808)
-[WebRTC tracking bug](https://bugs.chromium.org/p/webrtc/issues/detail?id=7634)