Revert of Sandbox html_viewer on Linux.

components/font_service/public/cpp/mapped_font_file.cc

-// 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.
-
-#include "components/font_service/public/cpp/mapped_font_file.h"
-
-#include "base/files/file_util.h"
-#include "base/threading/thread_restrictions.h"
-#include "skia/ext/refptr.h"
-#include "skia/ext/skia_utils_base.h"
-#include "third_party/skia/include/core/SkData.h"
-#include "third_party/skia/include/core/SkStream.h"
-
-namespace font_service {
-namespace internal {
-
-MappedFontFile::MappedFontFile(uint32_t font_id)
-    : font_id_(font_id), observer_(nullptr) {}
-
-bool MappedFontFile::Initialize(base::File file) {
-  base::ThreadRestrictions::ScopedAllowIO allow_mmap;
-  return mapped_font_file_.Initialize(file.Pass());
-}
-
-SkMemoryStream* MappedFontFile::CreateMemoryStream() {
-  DCHECK(mapped_font_file_.IsValid());
-  auto data = skia::AdoptRef(
-      SkData::NewWithProc(mapped_font_file_.data(), mapped_font_file_.length(),
-                          &MappedFontFile::ReleaseProc, this));
-  if (!data)
-    return nullptr;
-  AddRef();
-  return new SkMemoryStream(data.get());
-}
-
-MappedFontFile::~MappedFontFile() {
-  if (observer_)
-    observer_->OnMappedFontFileDestroyed(this);
-}
-
-// static
-void MappedFontFile::ReleaseProc(const void* ptr, void* context) {
-  base::ThreadRestrictions::ScopedAllowIO allow_munmap;
-  static_cast<MappedFontFile*>(context)->Release();
-}
-
-}  // namespace internal
-}  // namespace font_service