Move downloads API to extensions namespace

chrome/browser/download/chrome_download_manager_delegate.cc

Index: chrome/browser/download/chrome_download_manager_delegate.cc
diff --git a/chrome/browser/download/chrome_download_manager_delegate.cc b/chrome/browser/download/chrome_download_manager_delegate.cc
index 64c93d38b67761d6e74a09b78b3e788730815179..114277fb3fefd6c40f2f803067e0d1b4bb4abb23 100644
--- a/chrome/browser/download/chrome_download_manager_delegate.cc
+++ b/chrome/browser/download/chrome_download_manager_delegate.cc
@@ -536,9 +536,9 @@ void ChromeDownloadManagerDelegate::NotifyExtensions(
     const NotifyExtensionsCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 #if !defined(OS_ANDROID)
-  ExtensionDownloadsEventRouter* router =
-      DownloadServiceFactory::GetForBrowserContext(profile_)->
-      GetExtensionEventRouter();
+  extensions::ExtensionDownloadsEventRouter* router =
+      DownloadServiceFactory::GetForBrowserContext(profile_)
+          ->GetExtensionEventRouter();
   if (router) {
     base::Closure original_path_callback =
         base::Bind(callback, base::FilePath(),