Export GetLastCommittedEntryIndex and RemoveEntryAtIndex to Java layer

content/public/android/java/src/org/chromium/content_public/browser/NavigationController.java

Index: content/public/android/java/src/org/chromium/content_public/browser/NavigationController.java
diff --git a/content/public/android/java/src/org/chromium/content_public/browser/NavigationController.java b/content/public/android/java/src/org/chromium/content_public/browser/NavigationController.java
index d9c18690cb9d7a2eb9d74ddf54b2a01b278ffa06..13ec1892d5a45d982d0e963633ec2ec143097302 100644
--- a/content/public/android/java/src/org/chromium/content_public/browser/NavigationController.java
+++ b/content/public/android/java/src/org/chromium/content_public/browser/NavigationController.java
@@ -141,4 +141,16 @@ public interface NavigationController {
      *         exists.
      */
     public NavigationEntry getPendingEntry();
+
+    /**
+     * @return The index of the last committed entry.
+     */
+    public int getLastCommittedEntryIndex();
+
+    /**
+     * Removes the entry at the specified |index|.
+     * @return false, if the index is the last committed index or the pending entry. Otherwise this
+     *         call discards any transient or pending entries.
+     */
+    public boolean removeEntryAtIndex(int index);
 }