[Suggestions] Remove TreeNode.getSuggestionAt() in favor of a visitor.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/TreeNode.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/TreeNode.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/TreeNode.java
index f8e02ed00193395bf94beb83c33faf7c9473eaec..fa912194cf6c9295b0e42007e37ebc7faa5bc9fd 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/TreeNode.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/TreeNode.java
@@ -74,5 +74,12 @@ public interface TreeNode {
      * it for accessibility purposes.
      * @see NewTabPageAdapter#dismissItem
      */
-    public void dismissItem(int position, Callback<String> itemRemovedCallback);
+    void dismissItem(int position, Callback<String> itemRemovedCallback);
+
+    /**
+     * Iterates over all items under this subtree and visits them with the given
+     * {@link NodeVisitor}.
+     * @param visitor The {@link NodeVisitor} with which to visit all items under this subtree.
+     */
+    void visitItems(NodeVisitor visitor);
 }