[Android] Remove unused enhanced bookmark code.

chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksModel.java

Index: chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksModel.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksModel.java b/chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksModel.java
index d18ee5012fc9c01959f1a56b25352efd5739998d..31548dd22bc57056d062fdbcdc2361422e364e17 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksModel.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksModel.java
@@ -19,7 +19,6 @@ import org.chromium.components.bookmarks.BookmarkType;
 import org.chromium.components.dom_distiller.core.DomDistillerUrlUtils;
 import org.chromium.content_public.browser.WebContents;
 
-import java.util.Collections;
 import java.util.List;
 
 /**
@@ -165,13 +164,6 @@ public class EnhancedBookmarksModel {
     }
 
     /**
-     * @see BookmarksBridge#getUncategorizedBookmarkIDs()
-     */
-    public List<BookmarkId> getUncategorizedBookmarkIDs() {
-        return Collections.emptyList();
-    }
-
-    /**
      * @see BookmarksBridge#getAllFoldersWithDepths(List, List)
      */
     public void getAllFoldersWithDepths(List<BookmarkId> bookmarkList, List<Integer> depthList) {