Remove BrowserIterator

Use BrowserList directly instead.

[email protected]
BUG=558054

Review URL: https://codereview.chromium.org/1644773003

Cr-Commit-Position: refs/heads/master@{#372197}
diff --git a/chrome/browser/fast_shutdown_browsertest.cc b/chrome/browser/fast_shutdown_browsertest.cc
index e5070613..fda079b3 100644
--- a/chrome/browser/fast_shutdown_browsertest.cc
+++ b/chrome/browser/fast_shutdown_browsertest.cc
@@ -12,7 +12,7 @@
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
-#include "chrome/browser/ui/browser_iterator.h"
+#include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
@@ -58,9 +58,7 @@
 
   // Close the new window, removing the one and only beforeunload handler.
   ASSERT_EQ(2u, chrome::GetTotalBrowserCount());
-  chrome::BrowserIterator it;
-  it.Next();
-  chrome::CloseWindow(*it);
+  chrome::CloseWindow(*(BrowserList::GetInstance()->begin() + 1));
 
   // Need to wait for the renderer process to shutdown to ensure that we got the
   // set cookies IPC.