Bug 1387185 - remove --enable-safe-browsing option from moz.configure whitelist; r=mshal

This option does not exist in the old configure.

build/moz.configure/old.configure

@@ -209,7 +209,6 @@ def old_configure_options(*options):
     '--enable-raw',
     '--enable-readline',
     '--enable-reflow-perf',
-    '--enable-safe-browsing',
     '--enable-sandbox',
     '--enable-signmar',
     '--enable-simulator',