Remove TabStripModel wrapper use.

chrome/browser/extensions/api/alarms/alarms_api_unittest.cc

Index: chrome/browser/extensions/api/alarms/alarms_api_unittest.cc
diff --git a/chrome/browser/extensions/api/alarms/alarms_api_unittest.cc b/chrome/browser/extensions/api/alarms/alarms_api_unittest.cc
index 4460c298467d063034552e3aaf7d1061e08ef400..84036e2ec2cefad0c76ef87a2f8f3208616a6082 100644
--- a/chrome/browser/extensions/api/alarms/alarms_api_unittest.cc
+++ b/chrome/browser/extensions/api/alarms/alarms_api_unittest.cc
@@ -11,7 +11,8 @@
 #include "chrome/browser/extensions/extension_function_test_utils.h"
 #include "chrome/browser/extensions/test_extension_system.h"
 #include "chrome/browser/profiles/profile_manager.h"
-#include "chrome/browser/ui/browser_tabstrip.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "chrome/test/base/browser_with_test_window_test.h"
 #include "content/public/browser/web_contents.h"
@@ -61,7 +62,7 @@ class ExtensionAlarmsTest : public BrowserWithTestWindowTest {
 
     // Make sure there's a RenderViewHost for alarms to warn into.
     AddTab(browser(), extension_->GetBackgroundURL());
-    contents_ = chrome::GetActiveWebContents(browser());
+    contents_ = browser()->tab_strip_model()->GetActiveWebContents();
 
     current_time_ = base::Time::FromDoubleT(10);
     ON_CALL(mock_time_, Now())