Speculative revert to see if this change introduced a performance regression on Mac intl perf bots.

chrome/browser/sessions/session_restore.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/sessions/session_restore.h"
 
 #include <algorithm>
 #include <list>
 #include <set>
 #include <string>
@@ skipping 248 matching lines @@
 
 void TabLoader::LoadNextTab() {
   if (!tabs_to_load_.empty()) {
     NavigationController* tab = tabs_to_load_.front();
     DCHECK(tab);
     tabs_loading_.insert(tab);
     if (tabs_loading_.size() > max_parallel_tab_loads_)
       max_parallel_tab_loads_ = tabs_loading_.size();
     tabs_to_load_.pop_front();
     tab->LoadIfNecessary();
-    content::WebContents* contents = tab->GetWebContents();
-    if (contents) {
-      Browser* browser = browser::FindBrowserWithWebContents(contents);
-      if (browser && chrome::GetActiveWebContents(browser) != contents) {
+    if (tab->GetWebContents()) {
+      int tab_index;
+      Browser* browser = browser::FindBrowserForController(tab, &tab_index);
+      if (browser && browser->active_index() != tab_index) {
         // By default tabs are marked as visible. As only the active tab is
         // visible we need to explicitly tell non-active tabs they are hidden.
         // Without this call non-active tabs are not marked as backgrounded.
         //
         // NOTE: We need to do this here rather than when the tab is added to
         // the Browser as at that time not everything has been created, so that
         // the call would do nothing.
-        contents->WasHidden();
+        tab->GetWebContents()->WasHidden();
       }
     }
   }
 
   if (!tabs_to_load_.empty()) {
     force_load_timer_.Stop();
     // Each time we load a tab we also set a timer to force us to start loading
     // the next tab if this one doesn't load quickly enough.
     force_load_timer_.Start(FROM_HERE,
         base::TimeDelta::FromMilliseconds(force_load_delay_),
@@ skipping 808 matching lines @@
   if (active_session_restorers == NULL)
     return false;
   for (std::set<SessionRestoreImpl*>::const_iterator it =
            active_session_restorers->begin();
        it != active_session_restorers->end(); ++it) {
     if ((*it)->profile() == profile)
       return true;
   }
   return false;
 }