Make File::Duplicate() const

content/browser/tracing/file_tracing_provider_impl.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 "content/browser/tracing/file_tracing_provider_impl.h"
 
 #include "base/files/file_path.h"
 #include "base/trace_event/trace_event.h"
 
 namespace content {
 
 const char kFileTracingEventCategoryGroup[] = TRACE_DISABLED_BY_DEFAULT("file");
 
 FileTracingProviderImpl::FileTracingProviderImpl() {}
 FileTracingProviderImpl::~FileTracingProviderImpl() {}
 
 bool FileTracingProviderImpl::FileTracingCategoryIsEnabled() const {
   bool enabled;
   TRACE_EVENT_CATEGORY_GROUP_ENABLED(kFileTracingEventCategoryGroup, &enabled);
   return enabled;
 }
 
-void FileTracingProviderImpl::FileTracingEnable(void* id) {
+void FileTracingProviderImpl::FileTracingEnable(const void* id) {
   TRACE_EVENT_NESTABLE_ASYNC_BEGIN0(
       kFileTracingEventCategoryGroup, FILE_TRACING_PREFIX, id);
 }
 
-void FileTracingProviderImpl::FileTracingDisable(void* id) {
+void FileTracingProviderImpl::FileTracingDisable(const void* id) {
   TRACE_EVENT_NESTABLE_ASYNC_END0(
       kFileTracingEventCategoryGroup, FILE_TRACING_PREFIX, id);
 }
 
-void FileTracingProviderImpl::FileTracingEventBegin(
-    const char* name, void* id, const base::FilePath& path, int64_t size) {
+void FileTracingProviderImpl::FileTracingEventBegin(const char* name,
+                                                    const void* id,
+                                                    const base::FilePath& path,
+                                                    int64_t size) {
   TRACE_EVENT_NESTABLE_ASYNC_BEGIN2(kFileTracingEventCategoryGroup, name, id,
       "path", path.AsUTF8Unsafe(), "size", size);
 }
 
-void FileTracingProviderImpl::FileTracingEventEnd(const char* name, void* id) {
+void FileTracingProviderImpl::FileTracingEventEnd(const char* name,
+                                                  const void* id) {
   TRACE_EVENT_NESTABLE_ASYNC_END0(kFileTracingEventCategoryGroup, name, id);
 }
 
 }  // namespace content