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/event/touch.go

-// 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 event defines user input events.
-package event // import "golang.org/x/mobile/event"
-
-/*
-The best source on android input events is the NDK: include/android/input.h
-
-iOS event handling guide:
-https://developer.apple.com/library/ios/documentation/EventHandling/Conceptual/EventHandlingiPhoneOS
-*/
-
-import (
-        "fmt"
-
-        "golang.org/x/mobile/geom"
-)
-
-// Touch is a user touch event.
-//
-// On Android, this is an AInputEvent with AINPUT_EVENT_TYPE_MOTION.
-// On iOS, it is the UIEvent delivered to a UIView.
-type Touch struct {
-        Type TouchType
-        Loc  geom.Point
-}
-
-func (t Touch) String() string {
-        var ty string
-        switch t.Type {
-        case TouchStart:
-                ty = "start"
-        case TouchMove:
-                ty = "move "
-        case TouchEnd:
-                ty = "end  "
-        }
-        return fmt.Sprintf("Touch{ %s, %s }", ty, t.Loc)
-}
-
-// TouchType describes the type of a touch event.
-type TouchType byte
-
-const (
-        // TouchStart is a user first touching the device.
-        //
-        // On Android, this is a AMOTION_EVENT_ACTION_DOWN.
-        // On iOS, this is a call to touchesBegan.
-        TouchStart TouchType = iota
-
-        // TouchMove is a user dragging across the device.
-        //
-        // A TouchMove is delivered between a TouchStart and TouchEnd.
-        //
-        // On Android, this is a AMOTION_EVENT_ACTION_MOVE.
-        // On iOS, this is a call to touchesMoved.
-        TouchMove
-
-        // TouchEnd is a user no longer touching the device.
-        //
-        // On Android, this is a AMOTION_EVENT_ACTION_UP.
-        // On iOS, this is a call to touchesEnded.
-        TouchEnd
-)