Extract a DataSource interface for items shown in a status card.

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
index 935722a5e9fe1747b39dd3123d89d9d09d7e669a..cc83745a439d0a56a0fdb6ffabf5665a78c5531b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
@@ -57,7 +57,7 @@ public class NewTabPageAdapter extends Adapter<NewTabPageViewHolder>
      */
     private final List<ItemGroup> mGroups = new ArrayList<>();
     private final AboveTheFoldItem mAboveTheFold = new AboveTheFoldItem();
-    private final SigninPromoItem mSigninPromo = new SigninPromoItem();
+    private final SignInPromo mSigninPromo = new SignInPromo();
     private final AllDismissedItem mAllDismissed = new AllDismissedItem();
     private final Footer mFooter = new Footer();
     private final SpacingItem mBottomSpacer = new SpacingItem();
@@ -323,7 +323,7 @@ public class NewTabPageAdapter extends Adapter<NewTabPageViewHolder>
         }
 
         if (viewType == NewTabPageItem.VIEW_TYPE_PROMO) {
-            return new SigninPromoItem.ViewHolder(mRecyclerView, mUiConfig);
+            return new SignInPromo.ViewHolder(mRecyclerView, mUiConfig);
         }
 
         if (viewType == NewTabPageItem.VIEW_TYPE_FOOTER) {