Rewrite DownloadsApiTest in C++.

chrome/browser/download/download_extension_api.cc

Index: chrome/browser/download/download_extension_api.cc
diff --git a/chrome/browser/download/download_extension_api.cc b/chrome/browser/download/download_extension_api.cc
index b19c22c19b7bcf3c66c1b091a9f7e1de9c81d6bc..825a2f200487744fc6a122a42012da9678a17ded 100644
--- a/chrome/browser/download/download_extension_api.cc
+++ b/chrome/browser/download/download_extension_api.cc
@@ -37,9 +37,11 @@
 #include "chrome/browser/renderer_host/chrome_render_message_filter.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/webui/web_ui_util.h"
+#include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/download_interrupt_reasons.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_save_info.h"
+#include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/resource_dispatcher_host.h"
@@ -982,6 +984,8 @@ ExtensionDownloadsEventRouter::OnChangedStat::~OnChangedStat() {
 }
 
 void ExtensionDownloadsEventRouter::OnDownloadUpdated(DownloadItem* item) {
+  if (!profile_)
+    return;
   int download_id = item->GetId();
   if (item->GetState() == DownloadItem::REMOVING) {
     // The REMOVING state indicates that this item is being erased.
@@ -1106,10 +1110,13 @@ void ExtensionDownloadsEventRouter::ManagerGoingDown(
     DownloadManager* manager) {
   manager_->RemoveObserver(this);
   manager_ = NULL;
+  profile_ = NULL;
 }
 
 void ExtensionDownloadsEventRouter::DispatchEvent(
     const char* event_name, base::Value* arg) {
+  if (!profile_)
+    return;
   ListValue args;
   args.Append(arg);
   std::string json_args;
@@ -1119,4 +1126,11 @@ void ExtensionDownloadsEventRouter::DispatchEvent(
       json_args,
       profile_,
       GURL());
+  DownloadsNotificationSource notification_source;
+  notification_source.event_name = event_name;
+  notification_source.profile = profile_;
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_EXTENSION_DOWNLOADS_EVENT,
+      content::Source<DownloadsNotificationSource>(&notification_source),
+      content::Details<std::string>(&json_args));
 }