Revert of Add granular base::File tracing.

base/files/file_tracing.h

-// 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.
-
-#ifndef BASE_FILES_FILE_TRACING_H_
-#define BASE_FILES_FILE_TRACING_H_
-
-#include "base/basictypes.h"
-#include "base/macros.h"
-#include "base/trace_event/trace_event.h"
-
-#define FILE_TRACING_PREFIX "File"
-
-#define FILE_TRACING_BEGIN() \
-    TRACE_EVENT_NESTABLE_ASYNC_BEGIN0( \
-        base::kFileTracingEventCategoryGroup, FILE_TRACING_PREFIX, this)
-
-#define FILE_TRACING_END() \
-    TRACE_EVENT_NESTABLE_ASYNC_END0( \
-        base::kFileTracingEventCategoryGroup, FILE_TRACING_PREFIX, this)
-
-#define SCOPED_FILE_TRACE_WITH_SIZE(name, size) \
-    base::ScopedFileTrace scoped_file_trace; \
-    do { \
-      bool category_enabled; \
-      TRACE_EVENT_CATEGORY_GROUP_ENABLED( \
-          base::kFileTracingEventCategoryGroup, &category_enabled); \
-      if (category_enabled) \
-        scoped_file_trace.Initialize( \
-            FILE_TRACING_PREFIX "::" name, this, size); \
-    } while (0)
-
-#define SCOPED_FILE_TRACE(name) SCOPED_FILE_TRACE_WITH_SIZE(name, 0)
-
-namespace base {
-
-class File;
-
-extern const char kFileTracingEventCategoryGroup[];
-
-class ScopedFileTrace {
- public:
-  ScopedFileTrace();
-  ~ScopedFileTrace();
-
-  // Called only if the tracing category is enabled.
-  void Initialize(const char* event, File* file, int64 size);
-
- private:
-  // True if |Initialize()| has been called. Don't touch |path_|, |event_|,
-  // or |bytes_| if |initialized_| is false.
-  bool initialized_;
-
-  // The event name to trace (e.g. "Read", "Write"). Prefixed with "base::File".
-  const char* name_;
-
-  // The file being traced. Must outlive this class.
-  File* file_;
-
-  // The size (in bytes) of this trace. Not reported if 0.
-  int64 size_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedFileTrace);
-};
-
-}  // namespace base
-
-#endif  // BASE_FILES_FILE_TRACING_H_