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/font/font_test.go

Index: third_party/go/src/golang.org/x/mobile/font/font_test.go
diff --git a/third_party/go/src/golang.org/x/mobile/font/font_test.go b/third_party/go/src/golang.org/x/mobile/font/font_test.go
deleted file mode 100644
index b7c3f71827a3140e5887d229113292c95fedf8e8..0000000000000000000000000000000000000000
--- a/third_party/go/src/golang.org/x/mobile/font/font_test.go
+++ /dev/null
@@ -1,22 +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 linux darwin
-
-package font
-
-import (
-	"testing"
-
-	"code.google.com/p/freetype-go/freetype"
-)
-
-func TestLoadFonts(t *testing.T) {
-	if _, err := freetype.ParseFont(Default()); err != nil {
-		t.Fatalf("default font: %v", err)
-	}
-	if _, err := freetype.ParseFont(Monospace()); err != nil {
-		t.Fatalf("monospace font: %v", err)
-	}
-}