Backed out 2 changesets (bug 902474, bug 902462) due to Android 4.0 crashtest timeouts.

Backed out changeset ecf856c21136 (bug 902474)
Backed out changeset 25c8d8674c1f (bug 902462)
Bug 901963 - Fix crash in mozilla::plugins::PluginInstanceChild::SetWindowLongPtrWHook on Win64. r=ehsan