Const-ify DownloadStatusUpdaterDelegate methods.

content/browser/download/download_status_updater.cc

Index: content/browser/download/download_status_updater.cc
diff --git a/content/browser/download/download_status_updater.cc b/content/browser/download/download_status_updater.cc
index 5d3a11c83d212e6c84e181649039e6d02b133911..5ab65ad187d12c56d3f3bb43ef1fb299b4d7ca0b 100644
--- a/content/browser/download/download_status_updater.cc
+++ b/content/browser/download/download_status_updater.cc
@@ -24,13 +24,13 @@ void DownloadStatusUpdater::RemoveDelegate(
 }
 
 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;
@@ -43,9 +43,9 @@ bool DownloadStatusUpdater::GetProgress(float* progress,
   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();
   }