Remove all blimp engine code

blimp/engine/browser/font_data_fetcher_impl.cc

-// 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.
-
-#include "blimp/engine/browser/font_data_fetcher_impl.h"
-
-#include <memory>
-
-#include "base/memory/ptr_util.h"
-#include "base/task_runner_util.h"
-
-namespace blimp {
-namespace engine {
-
-namespace {
-// This is a temporary implementation which return a empty SkStream.
-std::unique_ptr<SkStream>
-FetchFontStreamOnFileThread(const std::string& font_hash) {
-  return base::MakeUnique<SkMemoryStream>();
-}
-
-}  // namespace
-
-FontDataFetcherImpl::FontDataFetcherImpl(
-    scoped_refptr<base::SingleThreadTaskRunner> file_task_runner)
-    : file_task_runner_(file_task_runner) {
-  DCHECK(file_task_runner_);
-}
-
-FontDataFetcherImpl::~FontDataFetcherImpl() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-}
-
-void FontDataFetcherImpl::FetchFontStream(
-    const std::string& font_hash, const FontResponseCallback& callback) const {
-  DCHECK(thread_checker_.CalledOnValidThread());
-
-  base::PostTaskAndReplyWithResult(
-      file_task_runner_.get(), FROM_HERE,
-      base::Bind(&FetchFontStreamOnFileThread, font_hash), callback);
-}
-
-}  // namespace engine
-}  // namespace blimp