Remove TabContents from TabStripModelObserver::ActiveTabChanged.

chrome/browser/ui/browser_instant_controller.cc

Index: chrome/browser/ui/browser_instant_controller.cc
diff --git a/chrome/browser/ui/browser_instant_controller.cc b/chrome/browser/ui/browser_instant_controller.cc
index b1252c558fbeca9178c8bcba57e132b317f2dd0e..1ad6c25b6b27792411ac6e05b15e8896b8ca0f24 100644
--- a/chrome/browser/ui/browser_instant_controller.cc
+++ b/chrome/browser/ui/browser_instant_controller.cc
@@ -28,12 +28,11 @@ namespace {
 // Returns true iff the search model for |tab| is in an NTP state, that is, a
 // state in which the Instant overlay may be showing custom NTP content in
 // EXTENDED mode.
-bool IsSearchModelNTP(TabContents* tab) {
-  if (!tab || !tab->web_contents())
+bool IsSearchModelNTP(content::WebContents* tab) {
+  if (!tab)
     return false;
-  content::WebContents* web_contents = tab->web_contents();
   chrome::search::SearchModel* model =
-      chrome::search::SearchTabHelper::FromWebContents(web_contents)->model();
+      chrome::search::SearchTabHelper::FromWebContents(tab)->model();
   return model && model->mode().is_ntp();
 }
 
@@ -134,8 +133,8 @@ void BrowserInstantController::OnPreferenceChanged(
 // BrowserInstantController, TabStripModelObserver implementation:
 
 void BrowserInstantController::ActiveTabChanged(
-    TabContents* old_contents,
-    TabContents* new_contents,
+    content::WebContents* old_contents,
+    content::WebContents* new_contents,
     int index,
     bool user_gesture) {
   if (instant()) {