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/java/javatest.go

Index: third_party/go/src/golang.org/x/mobile/bind/java/javatest.go
diff --git a/third_party/go/src/golang.org/x/mobile/bind/java/javatest.go b/third_party/go/src/golang.org/x/mobile/bind/java/javatest.go
deleted file mode 100644
index 08b0e049cfac5f5b12447058855096f90e1bc76c..0000000000000000000000000000000000000000
--- a/third_party/go/src/golang.org/x/mobile/bind/java/javatest.go
+++ /dev/null
@@ -1,18 +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.
-
-//+build ignore
-
-package main
-
-import (
-	"golang.org/x/mobile/app"
-	"golang.org/x/mobile/bind/java"
-
-	_ "golang.org/x/mobile/bind/java/testpkg/go_testpkg"
-)
-
-func main() {
-	app.Run(app.Callbacks{Start: java.Init})
-}