[EnhancedBookmarks] Fix a crash on exiting while loading.

chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkUtils.java
index 1d590c8ec4b8653458bf1478971e91d55edc70b2..6a8375a510a8b7fd26f55e3828b154a88dec31d8 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkUtils.java
@@ -280,4 +280,13 @@ public class EnhancedBookmarkUtils {
             ApiCompatibilityUtils.setTaskDescription(activity, description, null, 0);
         }
     }
+
+    /**
+     * Closes the EnhancedBookmark Activity on Phone. Does nothing on tablet.
+     */
+    public static void finishActivityOnPhone(Context context) {
+        if (context instanceof EnhancedBookmarkActivity) {
+            ((Activity) context).finish();
+        }
+    }
 }