Don't hold on to the adapter position during a dismissal animation.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java
index 6ebfa32e3979655cdf2c64d1290738bf18c79eea..1db039439303053043116bb0c0557a051b9ac763 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java
@@ -483,9 +483,7 @@ public class NewTabPageRecyclerView extends RecyclerView implements TouchDisable
      * in {@link CardViewHolder#onBindViewHolder()}.
      */
     public void dismissItemWithAnimation(final ViewHolder viewHolder) {
-        // We need to check the position, as the view holder might have been removed.
-        final int position = viewHolder.getAdapterPosition();
-        if (position == RecyclerView.NO_POSITION) {
+        if (viewHolder.getAdapterPosition() == RecyclerView.NO_POSITION) {
             // The item does not exist anymore, so ignore.
             return;
         }
@@ -513,13 +511,23 @@ public class NewTabPageRecyclerView extends RecyclerView implements TouchDisable
 
             @Override
             public void onAnimationEnd(Animator animation) {
-                getNewTabPageAdapter().dismissItem(position);
+                dismissItemInternal(viewHolder);
                 NewTabPageRecyclerView.this.onItemDismissFinished(viewHolder);
             }
         });
         animation.start();
     }
 
+    private void dismissItemInternal(ViewHolder viewHolder) {
+        // Re-check the position in case the adapter has changed.
+        final int position = viewHolder.getAdapterPosition();
+        if (position == RecyclerView.NO_POSITION) {
+            // The item does not exist anymore, so ignore.
+            return;
+        }
+        getNewTabPageAdapter().dismissItem(position);
+    }
+
     /**
      * @param animations in/out list holding the animators to play.
      * @param view  view to animate.