Revert "Upgrade to 5.0.71.48"

This reverts commit 8389745919cae02139ddc085a63c00d024269cf2.

Change-Id: Ic5c75c8b3ddaf795972372fbc863a514862953c1
diff --git a/test/mjsunit/debug-script.js b/test/mjsunit/debug-script.js
index 5396415..8874960 100644
--- a/test/mjsunit/debug-script.js
+++ b/test/mjsunit/debug-script.js
@@ -73,8 +73,8 @@
 
 // This has to be updated if the number of native scripts change.
 assertEquals(%NativeScriptsCount(), named_native_count);
-// The 'gc' extension and one or two extras scripts are loaded.
-assertTrue(extension_count == 2 || extension_count == 3);
+// Only the 'gc' extension is loaded.
+assertEquals(1, extension_count);
 // This script and mjsunit.js has been loaded.  If using d8, d8 loads
 // a normal script during startup too.
 assertTrue(normal_count == 2 || normal_count == 3);