Add TabStripModel as a parameter of some functions in TabStripModelObserver

chrome/browser/ui/browser_tab_strip_tracker.cc

Index: chrome/browser/ui/browser_tab_strip_tracker.cc
diff --git a/chrome/browser/ui/browser_tab_strip_tracker.cc b/chrome/browser/ui/browser_tab_strip_tracker.cc
index 1d5e56314007f6fac6d00fc5cbc6d7422ad8cd4d..16a532763668c45b767ad23c75bff4b759e3a51c 100644
--- a/chrome/browser/ui/browser_tab_strip_tracker.cc
+++ b/chrome/browser/ui/browser_tab_strip_tracker.cc
@@ -71,7 +71,8 @@ void BrowserTabStripTracker::MaybeTrackBrowser(Browser* browser) {
   const int active_index = tab_strip_model->active_index();
   for (int i = 0; i < tab_strip_model->count(); ++i) {
     tab_strip_model_observer_->TabInsertedAt(
-        tab_strip_model->GetWebContentsAt(i), i, i == active_index);
+        tab_strip_model, tab_strip_model->GetWebContentsAt(i), i,
+        i == active_index);
   }
 }