Fix a warning from the binder.

This patch fixes the following warning:
W/Binder: The following Binder class should be static or
  leaks might occur: android.view.textservice
  .SpellCheckerSession.InternalListener

...in hope of removing a possible memory leaks.
However in my tests it does nothing at all for the memory leak
in bug 5461066, so it was probably unrelated.

Change-Id: Id776665e9483121d22cc91e8d2d9f32e3413ec96
Bugs: 5481376,5461066

Author: Jean Chalard

core/java/android/view/textservice/SpellCheckerSession.java

@@ -123,7 +123,7 @@ public SpellCheckerSession(
         }
         mSpellCheckerInfo = info;
         mSpellCheckerSessionListenerImpl = new SpellCheckerSessionListenerImpl(mHandler);
-        mInternalListener = new InternalListener();
+        mInternalListener = new InternalListener(mSpellCheckerSessionListenerImpl);
         mTextServicesManager = tsm;
         mIsUsed = true;
         mSpellCheckerSessionListener = listener;
@@ -316,13 +316,19 @@ public interface SpellCheckerSessionListener {
         public void onGetSuggestions(SuggestionsInfo[] results);
     }
 
-    private class InternalListener extends ITextServicesSessionListener.Stub {
+    private static class InternalListener extends ITextServicesSessionListener.Stub {
+        private final SpellCheckerSessionListenerImpl mParentSpellCheckerSessionListenerImpl;
+
+        public InternalListener(SpellCheckerSessionListenerImpl spellCheckerSessionListenerImpl) {
+            mParentSpellCheckerSessionListenerImpl = spellCheckerSessionListenerImpl;
+        }
+
         @Override
         public void onServiceConnected(ISpellCheckerSession session) {
             if (DBG) {
                 Log.w(TAG, "SpellCheckerSession connected.");
             }
-            mSpellCheckerSessionListenerImpl.onServiceConnected(session);
+            mParentSpellCheckerSessionListenerImpl.onServiceConnected(session);
         }
     }