Fixing CatalogLoadingState @IntDef

Add missed entry.

Change-Id: I59d8ae5d67b42f8ea5cb52cae56d82db819ff8d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829264Reviewed-by: Cathy Li <chili@chromium.org>
Commit-Queue: Marcin Wiącek <marcin@mwiacek.com>
Cr-Commit-Position: refs/heads/master@{#706196}

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

@@ -84,7 +84,8 @@ public class ExploreSitesPage extends BasicNativePage {
             new PropertyModel.ReadableIntPropertyKey();
     private static final int UNKNOWN_NAV_CATEGORY = -1;
 
-    @IntDef({CatalogLoadingState.LOADING, CatalogLoadingState.SUCCESS, CatalogLoadingState.ERROR})
+    @IntDef({CatalogLoadingState.LOADING, CatalogLoadingState.SUCCESS, CatalogLoadingState.ERROR,
+            CatalogLoadingState.LOADING_NET})
     @Retention(RetentionPolicy.SOURCE)
     public @interface CatalogLoadingState {
         int LOADING = 1; // Loading catalog info from disk.