Remove some global headers.

Removing:
- JniInvocation.h
- ScopedLocalFrame.h

Now that all usage is cleaned up.

libnativehelper now exports "include" as well so that
its headers can be cleaned up in the same way.

Test: none
Bug: 63762847
Change-Id: Iee8f59542dc1c80e2e262d2faf4eea829426a0d8
diff --git a/JNIHelp.cpp b/JNIHelp.cpp
index 54012b8..5aefd42 100644
--- a/JNIHelp.cpp
+++ b/JNIHelp.cpp
@@ -23,8 +23,8 @@
 
 #define LOG_TAG "JNIHelp"
 
-#include "JniConstants.h"
-#include "JNIHelp.h"
+#include <nativehelper/JniConstants.h>
+#include <nativehelper/JNIHelp.h>
 #include "ALog-priv.h"
 
 #include <stdio.h>