Const-ify DownloadStatusUpdaterDelegate methods.

content/browser/download/download_status_updater.cc

 // Copyright (c) 2010 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/download/download_status_updater.h"
 
 #include "base/logging.h"
 #include "content/browser/download/download_status_updater_delegate.h"
 
 DownloadStatusUpdater::DownloadStatusUpdater() {
 }
 
 DownloadStatusUpdater::~DownloadStatusUpdater() {
 }
 
 void DownloadStatusUpdater::AddDelegate(
     DownloadStatusUpdaterDelegate* delegate) {
   delegates_.insert(delegate);
 }
 
 void DownloadStatusUpdater::RemoveDelegate(
     DownloadStatusUpdaterDelegate* delegate) {
   delegates_.erase(delegate);
 }
 
 bool DownloadStatusUpdater::GetProgress(float* progress,
-                                        int* download_count) {
+                                        int* download_count) const {
   *progress = 0;
   *download_count = GetInProgressDownloadCount();
 
   int64 received_bytes = 0;
   int64 total_bytes = 0;
-  for (DelegateSet::iterator i = delegates_.begin();
+  for (DelegateSet::const_iterator i = delegates_.begin();
        i != delegates_.end(); ++i) {
     if (!(*i)->IsDownloadProgressKnown())
       return false;
     received_bytes += (*i)->GetReceivedDownloadBytes();
     total_bytes += (*i)->GetTotalDownloadBytes();
   }
 
   if (total_bytes > 0)
     *progress = static_cast<float>(received_bytes) / total_bytes;
   return true;
 }
 
-int64 DownloadStatusUpdater::GetInProgressDownloadCount() {
+int64 DownloadStatusUpdater::GetInProgressDownloadCount() const {
   int64 download_count = 0;
-  for (DelegateSet::iterator i = delegates_.begin();
+  for (DelegateSet::const_iterator i = delegates_.begin();
        i != delegates_.end(); ++i) {
     download_count += (*i)->GetInProgressDownloadCount();
   }
 
   return download_count;
 }