Dev Channel Update

The Dev channel has been updated to 21.0.1180.15 for  Windows, Mac, Linux, and Chrome Frame platforms This version fixes a small sync problem (Issue: 134715) and contains a fix for Mac hardware with the Intel HD 4000 graphics chip (e.g. the new Macbook Airs), in order to prevent a resource leak which is causing a kernel panic on that hardware. This is a temporary change while we work on fixing...