Return a speed of 0 if a download is paused from DownloadItem, instead of checking when rendering.

chrome/browser/download/download_item.cc

Index: chrome/browser/download/download_item.cc
diff --git a/chrome/browser/download/download_item.cc b/chrome/browser/download/download_item.cc
index 3069e94802702bdf2b16a38f803414cac164c9e7..378187728a85168883192bf11c5ee7d1d2ed712c 100644
--- a/chrome/browser/download/download_item.cc
+++ b/chrome/browser/download/download_item.cc
@@ -325,6 +325,8 @@ bool DownloadItem::TimeRemaining(base::TimeDelta* remaining) const {
 }
 
 int64 DownloadItem::CurrentSpeed() const {
+  if (is_paused_)
+    return 0;
   base::TimeDelta diff = base::TimeTicks::Now() - start_tick_;
   int64 diff_ms = diff.InMilliseconds();
   return diff_ms == 0 ? 0 : received_bytes_ * 1000 / diff_ms;