Improve the UI for disabling off-store extension install.

chrome/browser/download/download_history.cc

Index: chrome/browser/download/download_history.cc
diff --git a/chrome/browser/download/download_history.cc b/chrome/browser/download/download_history.cc
index bb59dc911243f396c32401cbb9a2c8c6ca8fc752..be2368f3b0640fbfd1c945f0006828302ddad3c5 100644
--- a/chrome/browser/download/download_history.cc
+++ b/chrome/browser/download/download_history.cc
@@ -5,7 +5,7 @@
 #include "chrome/browser/download/download_history.h"
 
 #include "base/logging.h"
-#include "chrome/browser/download/chrome_download_manager_delegate.h"
+#include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/history/history_marshaling.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/download_item.h"
@@ -76,7 +76,7 @@ void DownloadHistory::AddEntry(
   // the neck first. YMMV.
   HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
   if (download_item->IsOtr() ||
-      ChromeDownloadManagerDelegate::IsExtensionDownload(download_item) ||
+      download_crx_util::IsExtensionDownload(*download_item) ||
       download_item->IsTemporary() || !hs) {
     callback.Run(download_item->GetId(), GetNextFakeDbHandle());
     return;