Remove all blimp client code.

blimp/client/core/config.gni

Index: blimp/client/core/config.gni
diff --git a/blimp/client/core/config.gni b/blimp/client/core/config.gni
deleted file mode 100644
index 53e5d804eeb1a672910f10f307c02243d5d31fb2..0000000000000000000000000000000000000000
--- a/blimp/client/core/config.gni
+++ /dev/null
@@ -1,10 +0,0 @@
-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-declare_args() {
-  # Enables the blimp client. This is required to get the actual implementation
-  # of blimp.
-  # By default, only a dummy-implementation is provided.
-  enable_blimp_client = false
-}