[Touchless] Fix CategoryCardViewHolderFactory compile.

Bug: 977713
Change-Id: I7735da146baf9661bc3a750109bd489d4856945e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693553Reviewed-by: Cathy Li <chili@chromium.org>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675882}

chrome/android/java/src/org/chromium/chrome/browser/explore_sites/CategoryCardViewHolderFactory.java

@@ -17,7 +17,7 @@ public class CategoryCardViewHolderFactory implements RecyclerViewAdapter.ViewHo
         CategoryCardViewHolderFactory.CategoryCardViewHolder> {
     private int mTileViewResource;
 
-    CategoryCardViewHolderFactory() {
+    public CategoryCardViewHolderFactory() {
         final int exploreSitesDenseVariation = ExploreSitesBridge.getDenseVariation();
         // Set the tile view to use based on the condensed variation.
         if (ExploreSitesBridge.isDense(exploreSitesDenseVariation)) {