Remove third_party/golang.org/x/mobile as it is no longer used with Go 1.5.

third_party/go/src/golang.org/x/mobile/bind/testdata/interfaces.go.golden

-// Package go_interfaces is an autogenerated binder stub for package interfaces.
-//   gobind -lang=go interfaces
-//
-// File is generated by gobind. Do not edit.
-package go_interfaces
-
-import (
-        "golang.org/x/mobile/bind/seq"
-        "interfaces"
-)
-
-func proxy_Add3(out, in *seq.Buffer) {
-        var param_r interfaces.I
-        param_r_ref := in.ReadRef()
-        if param_r_ref.Num < 0 { // go object
-                param_r = param_r_ref.Get().(interfaces.I)
-        } else { // foreign object
-                param_r = (*proxyI)(param_r_ref)
-        }
-        res := interfaces.Add3(param_r)
-        out.WriteInt32(res)
-}
-
-const (
-        proxyIDescriptor = "go.interfaces.I"
-        proxyIRandCode   = 0x10a
-)
-
-func proxyIRand(out, in *seq.Buffer) {
-        ref := in.ReadRef()
-        v := ref.Get().(interfaces.I)
-        res := v.Rand()
-        out.WriteInt32(res)
-}
-
-func init() {
-        seq.Register(proxyIDescriptor, proxyIRandCode, proxyIRand)
-}
-
-type proxyI seq.Ref
-
-func (p *proxyI) Rand() int32 {
-        in := new(seq.Buffer)
-        out := seq.Transact((*seq.Ref)(p), proxyIRandCode, in)
-        res_0 := out.ReadInt32()
-        return res_0
-}
-
-func proxy_Seven(out, in *seq.Buffer) {
-        res := interfaces.Seven()
-        out.WriteGoRef(res)
-}
-
-func init() {
-        seq.Register("interfaces", 1, proxy_Add3)
-        seq.Register("interfaces", 2, proxy_Seven)
-}