Revert of Add granular base::File tracing.

base/files/file_tracing.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 "base/files/file_tracing.h"
-
-#include "base/files/file.h"
-#include "base/files/file_path.h"
-
-namespace base {
-
-const char kFileTracingEventCategoryGroup[] = TRACE_DISABLED_BY_DEFAULT("file");
-
-ScopedFileTrace::ScopedFileTrace() : initialized_(false) {}
-
-ScopedFileTrace::~ScopedFileTrace() {
-  if (initialized_) {
-    if (size_) {
-      TRACE_EVENT_NESTABLE_ASYNC_END2(
-          kFileTracingEventCategoryGroup, name_, &file_->trace_enabler_,
-          "path", file_->path_.AsUTF8Unsafe(), "size", size_);
-    } else {
-      TRACE_EVENT_NESTABLE_ASYNC_END1(
-          kFileTracingEventCategoryGroup, name_, &file_->trace_enabler_,
-          "path", file_->path_.AsUTF8Unsafe());
-    }
-  }
-}
-
-void ScopedFileTrace::Initialize(const char* name, File* file, int64 size) {
-  file_ = file;
-  name_ = name;
-  size_ = size;
-  initialized_ = true;
-
-  if (size_) {
-    TRACE_EVENT_NESTABLE_ASYNC_BEGIN2(
-        kFileTracingEventCategoryGroup, name_, &file_->trace_enabler_,
-        "path", file_->path_.AsUTF8Unsafe(), "size", size_);
-  } else {
-    TRACE_EVENT_NESTABLE_ASYNC_BEGIN1(
-        kFileTracingEventCategoryGroup, name_, &file_->trace_enabler_,
-        "path", file_->path_.AsUTF8Unsafe());
-  }
-}
-
-}  // namespace base