Delete deprecated APIs addObserver and removeObserver.

Test: deleting deprecated code, existing test passes.
Bug: 232959004
Change-Id: I76ee9f91c645dabeee932940d56beccf9ca75d7e
diff --git a/framework/java/android/app/appsearch/GlobalSearchSession.java b/framework/java/android/app/appsearch/GlobalSearchSession.java
index e079de5..7532b87 100644
--- a/framework/java/android/app/appsearch/GlobalSearchSession.java
+++ b/framework/java/android/app/appsearch/GlobalSearchSession.java
@@ -427,20 +427,6 @@
     }
 
     /**
-     * @deprecated use #registerObserverCallback.
-     * @hide
-     */
-    @UnsupportedAppUsage
-    @Deprecated
-    public void addObserver(
-            @NonNull String observedPackage,
-            @NonNull ObserverSpec spec,
-            @NonNull Executor executor,
-            @NonNull AppSearchObserverCallback observer) throws AppSearchException {
-        registerObserverCallback(observedPackage, spec, executor, observer);
-    }
-
-    /**
      * Removes previously registered {@link ObserverCallback} instances from the system.
      *
      * <p>All instances of {@link ObserverCallback} which are registered to observe
@@ -497,19 +483,6 @@
         }
     }
 
-
-    /**
-     * @deprecated use #unregisterObserverCallback.
-     * @hide
-     */
-    @UnsupportedAppUsage
-    @Deprecated
-    public void removeObserver(
-            @NonNull String targetPackageName,
-            @NonNull AppSearchObserverCallback observer) throws AppSearchException {
-        unregisterObserverCallback(targetPackageName, observer);
-    }
-
     /**
      * Closes the {@link GlobalSearchSession}. Persists all mutations, including usage reports, to
      * disk.