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

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SectionHeader.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SectionHeader.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SectionHeader.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SectionHeader.java
index 76899c3c982815148cdf566df1673b0005a2f1e6..9f70931fd5503a41c69b84d6087df97e9f3cd437 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SectionHeader.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SectionHeader.java
@@ -6,10 +6,11 @@ package org.chromium.chrome.browser.ntp.snippets;
 
 import org.chromium.chrome.browser.ntp.cards.ItemViewType;
 import org.chromium.chrome.browser.ntp.cards.NewTabPageViewHolder;
+import org.chromium.chrome.browser.ntp.cards.NodeVisitor;
 import org.chromium.chrome.browser.ntp.cards.OptionalLeaf;
 
 /**
- * Represents the data for a header of a group of snippets
+ * Represents the data for a header of a group of snippets.
  */
 public class SectionHeader extends OptionalLeaf {
     /** The header text to be shown. */
@@ -35,4 +36,9 @@ public class SectionHeader extends OptionalLeaf {
         assert holder instanceof SectionHeaderViewHolder;
         ((SectionHeaderViewHolder) holder).onBindViewHolder(this);
     }
-}
+
+    @Override
+    public void visitOptionalItem(NodeVisitor visitor) {
+        visitor.visitHeader();
+    }
+}