Remove TabStripModel wrapper use.

chrome/browser/history/multipart_browsertest.cc

Index: chrome/browser/history/multipart_browsertest.cc
diff --git a/chrome/browser/history/multipart_browsertest.cc b/chrome/browser/history/multipart_browsertest.cc
index 7b86bca8bc4bb1ebbaf88383282761c165f266f0..2e40265b534a7671ec348c50b69814d898d429bb 100644
--- a/chrome/browser/history/multipart_browsertest.cc
+++ b/chrome/browser/history/multipart_browsertest.cc
@@ -5,7 +5,7 @@
 #include "base/file_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_tabstrip.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/web_contents.h"
@@ -36,11 +36,11 @@ IN_PROC_BROWSER_TEST_F(MultipartResponseTest, DISABLED_SingleVisit) {
   // creates one entry in the visits table.
   ASSERT_TRUE(test_server()->Start());
 
-  Observe(chrome::GetActiveWebContents(browser()));
+  Observe(browser()->tab_strip_model()->GetActiveWebContents());
   ui_test_utils::NavigateToURL(browser(), test_server()->GetURL("multipart"));
 
   EXPECT_EQ(ASCIIToUTF16("page 9"),
-            chrome::GetActiveWebContents(browser())->GetTitle());
+            browser()->tab_strip_model()->GetActiveWebContents()->GetTitle());
   EXPECT_EQ(1, update_history_count_);
   EXPECT_GT(did_navigate_any_frame_count_, update_history_count_);
 }