views: Use Tab pointer directly when calling TabStrip::tab_at.

chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc

Index: chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
diff --git a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
index 7ddbd68b075c51f85321b301bd8e0b97e0b14e28..dd7b8ccaa75af398829a9be96359a1a447e59c36 100644
--- a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
+++ b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
@@ -292,8 +292,8 @@ void BrowserTabStripController::UpdateLoadingAnimations() {
   // before we've applied an update from the model (Browser::TabInsertedAt may
   // be processed before us and invokes this).
   for (int i = 0, tab_count = tabstrip_->tab_count(); i < tab_count; ++i) {
-    BaseTab* tab = tabstrip_->tab_at(i);
     if (model_->ContainsIndex(i)) {
+      Tab* tab = tabstrip_->tab_at(i);
       TabContents* contents = model_->GetTabContentsAt(i);
       tab->UpdateLoadingAnimation(
           TabContentsNetworkState(contents->web_contents()));