Add conversion from Handle to UntypedHandle

mojo/android/system/src/org/chromium/mojo/system/UntypedHandleImpl.java

Index: mojo/android/system/src/org/chromium/mojo/system/UntypedHandleImpl.java
diff --git a/mojo/android/system/src/org/chromium/mojo/system/UntypedHandleImpl.java b/mojo/android/system/src/org/chromium/mojo/system/UntypedHandleImpl.java
index 85c769132fedd94f860cd2a682e1087504d0e44b..31ad8be0271c4a58ac24a9ccbf9d0d221c18a494 100644
--- a/mojo/android/system/src/org/chromium/mojo/system/UntypedHandleImpl.java
+++ b/mojo/android/system/src/org/chromium/mojo/system/UntypedHandleImpl.java
@@ -10,16 +10,23 @@ import org.chromium.mojo.system.DataPipe.ProducerHandle;
 /**
  * Implementation of {@link UntypedHandle}.
  */
-class UntypedHandleImpl extends HandleImpl implements UntypedHandle {
+class UntypedHandleImpl extends HandleBase implements UntypedHandle {
 
     /**
-     * @see HandleImpl#HandleImpl(CoreImpl, int)
+     * @see HandleBase#HandleBase(CoreImpl, int)
      */
     UntypedHandleImpl(CoreImpl core, int mojoHandle) {
         super(core, mojoHandle);
     }
 
     /**
+     * @see HandleBase#HandleBase(HandleBase)
+     */
+    UntypedHandleImpl(HandleBase handle) {
+        super(handle);
+    }
+
+    /**
      * @see org.chromium.mojo.system.UntypedHandle#toMessagePipeHandle()
      */
     @Override