Bug 1337331 Part 5: Re-apply - Add KEY_WOW64_64Key and KEY_WOW64_32KEY to the Chromium sandbox allowed registry read flags. r=aklotz

Carrying r=aklotz from previous changset:
https://hg.mozilla.org/mozilla-central/rev/d24db55deb85

security/sandbox/chromium/sandbox/win/src/registry_policy.cc

@@ -20,7 +20,8 @@ namespace {
 
 static const uint32_t kAllowedRegFlags =
     KEY_QUERY_VALUE | KEY_ENUMERATE_SUB_KEYS | KEY_NOTIFY | KEY_READ |
-    GENERIC_READ | GENERIC_EXECUTE | READ_CONTROL;
+    GENERIC_READ | GENERIC_EXECUTE | READ_CONTROL | KEY_WOW64_64KEY |
+    KEY_WOW64_32KEY;
 
 // Opens the key referenced by |obj_attributes| with |access| and
 // checks what permission was given. Remove the WRITE flags and update