Revert "Make THEATER_MODE_ON setting a system api."

This reverts commit 35dafda1b0357eb0f2eef766427a2b473967a918.

Change-Id: I76e72592791682e0dbee719fbd518962a1bdcd11
diff --git a/api/system-current.txt b/api/system-current.txt
index 45e8f87..39685ae 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -26872,7 +26872,6 @@
     field public static final java.lang.String SHOW_PROCESSES = "show_processes";
     field public static final java.lang.String STAY_ON_WHILE_PLUGGED_IN = "stay_on_while_plugged_in";
     field public static final java.lang.String SYS_PROP_SETTING_VERSION = "sys.settings_global_version";
-    field public static final java.lang.String THEATER_MODE_ON = "theater_mode_on";
     field public static final java.lang.String TRANSITION_ANIMATION_SCALE = "transition_animation_scale";
     field public static final java.lang.String USB_MASS_STORAGE_ENABLED = "usb_mass_storage_enabled";
     field public static final java.lang.String USE_GOOGLE_MAIL = "use_google_mail";
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 92349338..838686a 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -5101,7 +5101,6 @@
          * Whether Theater Mode is on.
          * {@hide}
          */
-        @SystemApi
         public static final String THEATER_MODE_ON = "theater_mode_on";
 
         /**