Update to GWT 2.1.1
Update to GWT 2.1.1

We need to use gwtjsonrpc 1.2.3 as it has support for the
newer GWT remote APIs.

Change-Id: I83bfe72d51611d4ee6f201f524c45d3ec2d020ed
Signed-off-by: Shawn O. Pearce <f3ea74d906fa9fe97c1fef6bad9cb871485c7045@google.com>

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