Remove all blimp client code.

blimp/client/support/compositor/blimp_layer_tree_settings.h

-// Copyright 2015 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.
-
-#ifndef BLIMP_CLIENT_SUPPORT_COMPOSITOR_BLIMP_LAYER_TREE_SETTINGS_H_
-#define BLIMP_CLIENT_SUPPORT_COMPOSITOR_BLIMP_LAYER_TREE_SETTINGS_H_
-
-namespace cc {
-class LayerTreeSettings;
-}
-
-namespace blimp {
-namespace client {
-
-// Populates client |settings| based on defaults & command line flags.  This
-// might have to be tweaked into a message protocol if it turns out
-// the host compositor needs to actually drive some specific settings of the
-// client.
-void PopulateCommonLayerTreeSettings(cc::LayerTreeSettings* settings);
-
-}  // namespace client
-}  // namespace blimp
-
-#endif  // BLIMP_CLIENT_SUPPORT_COMPOSITOR_BLIMP_LAYER_TREE_SETTINGS_H_