Export GetLastCommittedEntryIndex and RemoveEntryAtIndex to Java layer

chrome/android/javatests/src/org/chromium/chrome/browser/NavigationPopupTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/NavigationPopupTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/NavigationPopupTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/NavigationPopupTest.java
index 9c7d855891b3e5e16146d7abd680ca9b15e14373..2dd9faa5d093ac0a60b82e0889770fc58d575c95 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/NavigationPopupTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/NavigationPopupTest.java
@@ -163,6 +163,16 @@ public class NavigationPopupTest extends ChromeShellTestBase {
         public void goToNavigationIndex(int index) {
             mNavigatedIndex = index;
         }
+
+        @Override
+        public int getLastCommittedEntryIndex() {
+            return -1;
+        }
+
+        @Override
+        public boolean removeEntryAtIndex(int index) {
+            return false;
+        }
     }
 
     @MediumTest