Revert "Annotate @SystemApi on some WifiManager methods."

This reverts commit 041bcc22bd21f84358e5b2102e3a919bcdd99b81.

Bug: 17134034
Change-Id: I1ebcdd9b4c56e5c93fd5667699c8971e8c6e5452
diff --git a/wifi/java/android/net/wifi/WifiManager.java b/wifi/java/android/net/wifi/WifiManager.java
index 3d976e7..e27bd7e 100644
--- a/wifi/java/android/net/wifi/WifiManager.java
+++ b/wifi/java/android/net/wifi/WifiManager.java
@@ -1696,7 +1696,6 @@
      *
      * @hide
      */
-    @SystemApi
     public void connect(WifiConfiguration config, ActionListener listener) {
         if (config == null) throw new IllegalArgumentException("config cannot be null");
         validateChannel();
@@ -1719,7 +1718,6 @@
      * initialized again
      * @hide
      */
-    @SystemApi
     public void connect(int networkId, ActionListener listener) {
         if (networkId < 0) throw new IllegalArgumentException("Network id cannot be negative");
         validateChannel();
@@ -1744,7 +1742,6 @@
      * initialized again
      * @hide
      */
-    @SystemApi
     public void save(WifiConfiguration config, ActionListener listener) {
         if (config == null) throw new IllegalArgumentException("config cannot be null");
         validateChannel();
@@ -1764,7 +1761,6 @@
      * initialized again
      * @hide
      */
-    @SystemApi
     public void forget(int netId, ActionListener listener) {
         if (netId < 0) throw new IllegalArgumentException("Network id cannot be negative");
         validateChannel();
@@ -1780,7 +1776,6 @@
      * initialized again
      * @hide
      */
-    @SystemApi
     public void disable(int netId, ActionListener listener) {
         if (netId < 0) throw new IllegalArgumentException("Network id cannot be negative");
         validateChannel();