Remove all //blimp code.

blimp/tools/Dockerfile.base

-# Blimp base Dockerfile. Should be used by all Dockerfiles used by Blimp to
-# ensure test and release binaries all run under the same system environment.
-FROM ubuntu:trusty
-
-# Run the command below to update the lib list.
-# ldd ./blimp_engine_app | grep usr/lib | awk '{print $3}' | xargs -n1 \
-#   dpkg-query -S | awk -F: '{print $1}' | sort | uniq
-RUN apt-get update && \
-  apt-get install -yq libdrm2 libfontconfig1 libfreetype6 libgraphite2-3 \
-  libharfbuzz0b libnspr4 libnss3 libstdc++6
-
-# stunnel4 is needed for incoming TLS connections.
-# wget is needed for crash reporting.
-RUN apt-get update && apt-get install -yq stunnel4 wget
-
-# gdb and strace are not strictly required, but having them around makes
-# debugging easier.
-RUN apt-get update && apt-get install -yq gdb strace