Sidebar mini tabs UI (views version)....

chrome/browser/ui/cocoa/browser_window_cocoa.mm

Index: chrome/browser/ui/cocoa/browser_window_cocoa.mm
===================================================================
--- chrome/browser/ui/cocoa/browser_window_cocoa.mm	(revision 74134)
+++ chrome/browser/ui/cocoa/browser_window_cocoa.mm	(working copy)
@@ -613,8 +613,7 @@
       [controller_ updateBookmarkBarVisibilityWithAnimation:YES];
       break;
     case NotificationType::SIDEBAR_CHANGED:
-      UpdateSidebarForContents(
-          Details<SidebarContainer>(details)->tab_contents());
+      UpdateSidebar(Details<SidebarChangedDetails>(details).ptr());
       break;
     default:
       NOTREACHED();  // we don't ask for anything else!
@@ -633,8 +632,8 @@
   return [controller_ window];
 }
 
-void BrowserWindowCocoa::UpdateSidebarForContents(TabContents* tab_contents) {
-  if (tab_contents == browser_->GetSelectedTabContents()) {
-    [controller_ updateSidebarForContents:tab_contents];
+void BrowserWindowCocoa::UpdateSidebar(SidebarChangedDetails* details) {
+  if (details->source->tab() == browser_->GetSelectedTabContentsWrapper()) {
+    [controller_ updateSidebarForTab:details->source->tab()];
   }
 }