Make the UI an observer of downloads.

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 dec52fc3853fec32e1b7fbfd15e1308c8bfdaf1a..6fd5bdb8c8e222c34e4fb5f6cbe45b824203db92 100644
--- a/chrome/browser/download/chrome_download_manager_delegate.cc
+++ b/chrome/browser/download/chrome_download_manager_delegate.cc
@@ -36,7 +36,6 @@
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
-#include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/feature_switch.h"
@@ -56,7 +55,6 @@
 
 #if !defined(OS_ANDROID)
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_finder.h"
 #endif
 
 #if defined(OS_CHROMEOS)
@@ -258,21 +256,6 @@ FilePath ChromeDownloadManagerDelegate::GetIntermediatePath(
   return dir.Append(file_name);
 }
 
-WebContents* ChromeDownloadManagerDelegate::
-    GetAlternativeWebContentsToNotifyForDownload() {
-#if defined(OS_ANDROID)
-  // Android does not implement BrowserList or any other way to get an
-  // alternate web contents.
-  return NULL;
-#else
-  // Start the download in the last active browser. This is not ideal but better
-  // than fully hiding the download from the user.
-  Browser* last_active = chrome::FindLastActiveWithProfile(profile_,
-      chrome::GetActiveDesktop());
-  return last_active ? chrome::GetActiveWebContents(last_active) : NULL;
-#endif
-}
-
 bool ChromeDownloadManagerDelegate::ShouldOpenFileBasedOnExtension(
     const FilePath& path) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));