Remove all blimp engine code

blimp/engine/browser/font_data_fetcher.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_ENGINE_BROWSER_FONT_DATA_FETCHER_H_
-#define BLIMP_ENGINE_BROWSER_FONT_DATA_FETCHER_H_
-
-#include <memory>
-#include <string>
-
-#include "base/callback.h"
-#include "base/memory/ptr_util.h"
-#include "third_party/skia/include/core/SkStream.h"
-
-namespace blimp {
-namespace engine {
-
-// FontDataFetcher does the real work of fetching font data.
-// It should be created, called, and destroyed from the same thread.
-class FontDataFetcher {
- public:
-  using FontResponseCallback =
-      base::Callback<void(std::unique_ptr<SkStream>)>;
-
-  virtual ~FontDataFetcher() {}
-
-  // Asynchronously loads the font identified by |font_hash| and invokes
-  // |callback| with an SkStream containing the font data.
-  // If there is no font for font_hash, the SkStream will be empty.
-  virtual void FetchFontStream(const std::string& font_hash,
-                               const FontResponseCallback& callback) const = 0;
-};
-
-}  // namespace engine
-}  // namespace blimp
-
-#endif  // BLIMP_ENGINE_BROWSER_FONT_DATA_FETCHER_H_