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/seq/ref.go

Index: third_party/go/src/golang.org/x/mobile/bind/seq/ref.go
diff --git a/third_party/go/src/golang.org/x/mobile/bind/seq/ref.go b/third_party/go/src/golang.org/x/mobile/bind/seq/ref.go
deleted file mode 100644
index 0ebd89654f89af6e9e2c2369a1df8c0d4442dc56..0000000000000000000000000000000000000000
--- a/third_party/go/src/golang.org/x/mobile/bind/seq/ref.go
+++ /dev/null
@@ -1,60 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package seq
-
-//#cgo LDFLAGS: -llog
-//#include <android/log.h>
-//#include <string.h>
-//import "C"
-
-import (
-	"fmt"
-	"sync"
-)
-
-// refs stores Go objects that have been passed to another language.
-var refs struct {
-	sync.Mutex
-	next int32 // next reference number to use for Go object, always negative
-	refs map[interface{}]int32
-	objs map[int32]interface{}
-}
-
-func init() {
-	refs.Lock()
-	refs.next = -24 // Go objects get negative reference numbers. Arbitrary starting point.
-	refs.refs = make(map[interface{}]int32)
-	refs.objs = make(map[int32]interface{})
-	refs.Unlock()
-}
-
-// A Ref represents a Java or Go object passed across the language
-// boundary.
-type Ref struct {
-	Num int32
-}
-
-// Get returns the underlying object.
-func (r *Ref) Get() interface{} {
-	refs.Lock()
-	obj, ok := refs.objs[r.Num]
-	refs.Unlock()
-	if !ok {
-		panic(fmt.Sprintf("unknown ref %d", r.Num))
-	}
-	return obj
-}
-
-// Delete remove the reference to the underlying object.
-func Delete(num int32) {
-	refs.Lock()
-	obj, ok := refs.objs[num]
-	if !ok {
-		panic(fmt.Sprintf("seq.Delete unknown refnum: %d", num))
-	}
-	delete(refs.objs, num)
-	delete(refs.refs, obj)
-	refs.Unlock()
-}