Switch SupportsUserData uses to use unique_ptr.

chrome/browser/ui/tabs/tab_strip_model_unittest.cc

Index: chrome/browser/ui/tabs/tab_strip_model_unittest.cc
diff --git a/chrome/browser/ui/tabs/tab_strip_model_unittest.cc b/chrome/browser/ui/tabs/tab_strip_model_unittest.cc
index f040375f844bf6032b3b6167f6aa9f4a93631bdf..af629584b5b30c2a78d41afe2f07479d446f23d4 100644
--- a/chrome/browser/ui/tabs/tab_strip_model_unittest.cc
+++ b/chrome/browser/ui/tabs/tab_strip_model_unittest.cc
@@ -12,6 +12,7 @@
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
@@ -198,7 +199,7 @@ class TabStripModelTest : public ChromeRenderViewHostTestHarness {
   // Sets the id of the specified contents.
   void SetID(WebContents* contents, int id) {
     contents->SetUserData(&kTabStripModelTestIDUserDataKey,
-                          new TabStripModelTestIDUserData(id));
+                          base::MakeUnique<TabStripModelTestIDUserData>(id));
   }
 
   // Returns the id of the specified contents.