Replace most BrowserList::empty() and BrowserList::size() calls by multi-desktop aware calls.

chrome/browser/ui/uma_browsing_activity_observer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/uma_browsing_activity_observer.h"
 
 #include "base/metrics/histogram.h"
 #include "chrome/browser/ui/browser.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/browser_window.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
 
 namespace chrome {
 namespace {
 
 UMABrowsingActivityObserver* g_instance = NULL;
 
 }  // namespace
 
 // static
 void UMABrowsingActivityObserver::Init() {
   DCHECK(!g_instance);
-  DCHECK(BrowserList::empty());  // Must be created before any Browsers are.
+  // Must be created before any Browsers are.
+  DCHECK_EQ(0U, chrome::GetTotalBrowserCount());
   g_instance = new UMABrowsingActivityObserver;
 }
 
 UMABrowsingActivityObserver::UMABrowsingActivityObserver() {
   registrar_.Add(this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
                   content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
                   content::NotificationService::AllSources());
 }
 
@@ skipping 66 matching lines @@
                            app_window_count);
   UMA_HISTOGRAM_COUNTS_100("WindowManager.PanelWindowCountPerLoad",
                            panel_window_count);
   UMA_HISTOGRAM_COUNTS_100("WindowManager.PopUpWindowCountPerLoad",
                            popup_window_count);
   UMA_HISTOGRAM_COUNTS_100("WindowManager.TabbedWindowCountPerLoad",
                            tabbed_window_count);
 }
 
 }  // namespace chrome