content/ui[Android]: Remove ContextProviderFactory.

content/test/mock_gpu_channel_establish_factory.cc

-// Copyright 2011 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.
-
-#include "content/test/mock_gpu_channel_establish_factory.h"
-
-namespace content {
-
-MockGpuChannelEstablishFactory::MockGpuChannelEstablishFactory() = default;
-
-MockGpuChannelEstablishFactory::~MockGpuChannelEstablishFactory() = default;
-
-void MockGpuChannelEstablishFactory::EstablishGpuChannel(
-    const gpu::GpuChannelEstablishedCallback& callback) {
-  callback.Run(nullptr);
-}
-
-scoped_refptr<gpu::GpuChannelHost>
-MockGpuChannelEstablishFactory::EstablishGpuChannelSync() {
-  return nullptr;
-}
-
-gpu::GpuMemoryBufferManager*
-MockGpuChannelEstablishFactory::GetGpuMemoryBufferManager() {
-  return nullptr;
-}
-
-}  // namespace content