Remove all blimp client code.

blimp/client/test/compositor/test_blimp_embedder_compositor.h

-// 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.
-
-#ifndef BLIMP_CLIENT_TEST_COMPOSITOR_TEST_BLIMP_EMBEDDER_COMPOSITOR_H_
-#define BLIMP_CLIENT_TEST_COMPOSITOR_TEST_BLIMP_EMBEDDER_COMPOSITOR_H_
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "blimp/client/support/compositor/blimp_embedder_compositor.h"
-
-namespace blimp {
-namespace client {
-class CompositorDependencies;
-
-// An implementation of the BlimpEmbedderCompositor that supplies a
-// ContextProvider that is not backed by a platform specific widget.  It is not
-// meant to be used to actually display content.
-class TestBlimpEmbedderCompositor : public BlimpEmbedderCompositor {
- public:
-  explicit TestBlimpEmbedderCompositor(
-      CompositorDependencies* compositor_dependencies);
-  ~TestBlimpEmbedderCompositor() override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(TestBlimpEmbedderCompositor);
-};
-
-}  // namespace client
-}  // namespace blimp
-
-#endif  // BLIMP_CLIENT_TEST_COMPOSITOR_TEST_BLIMP_EMBEDDER_COMPOSITOR_H_