Move onBindViewHolder from NewTabPageViewHolder to NewTabPageItem.

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 be412212b4aa4c9c3c1ce72f2ca6fa4d56afa819..6e3bdf47afaa10837ffe74d1f58d5c110f37f668 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
@@ -5,6 +5,7 @@
 package org.chromium.chrome.browser.ntp.snippets;
 
 import org.chromium.chrome.browser.ntp.cards.NewTabPageItem;
+import org.chromium.chrome.browser.ntp.cards.NewTabPageViewHolder;
 
 /**
  * Represents the data for a header of a group of snippets
@@ -36,4 +37,10 @@ public class SectionHeader implements NewTabPageItem {
     public String getHeaderText() {
         return mHeaderText;
     }
+
+    @Override
+    public void onBindViewHolder(NewTabPageViewHolder holder) {
+        assert holder instanceof SectionHeaderViewHolder;
+        ((SectionHeaderViewHolder) holder).onBindViewHolder(this);
+    }
 }