Remove an API that doesn't exist.

Apparently this was removed in Jelly Bean:
https://stackoverflow.com/q/24312632/632035. Keeping the decl in the
NDK just confuses people: https://stackoverflow.com/q/49646596/632035.

Test: make checkbuild
Bug: None
Change-Id: Id6cfc5df8418e1c872697ff64f9b86fe135b9dc8
diff --git a/include/android/native_window_jni.h b/include/android/native_window_jni.h
index 23b39aa..082fab2 100644
--- a/include/android/native_window_jni.h
+++ b/include/android/native_window_jni.h
@@ -44,16 +44,6 @@
  */
 ANativeWindow* ANativeWindow_fromSurface(JNIEnv* env, jobject surface);
 
-#if __ANDROID_API__ >= 13
-/**
- * Return the ANativeWindow associated with a Java SurfaceTexture object,
- * for interacting with it through native code.  This acquires a reference
- * on the ANativeWindow that is returned; be sure to use ANativeWindow_release()
- * when done with it so that it doesn't leak.
- */
-ANativeWindow* ANativeWindow_fromSurfaceTexture(JNIEnv* env, jobject surfaceTexture);
-#endif
-
 #if __ANDROID_API__ >= 26
 /**
  * Return a Java Surface object derived from the ANativeWindow, for interacting