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/cmd/gomobile/manifest.go

-// Copyright 2015 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 main
-
-import (
-        "encoding/xml"
-        "errors"
-        "fmt"
-        "html/template"
-)
-
-type manifestXML struct {
-        Activity activityXML `xml:"application>activity"`
-}
-
-type activityXML struct {
-        Name     string        `xml:"name,attr"`
-        MetaData []metaDataXML `xml:"meta-data"`
-}
-
-type metaDataXML struct {
-        Name  string `xml:"name,attr"`
-        Value string `xml:"value,attr"`
-}
-
-// manifestLibName parses the AndroidManifest.xml and finds the library
-// name of the NativeActivity.
-func manifestLibName(data []byte) (string, error) {
-        manifest := new(manifestXML)
-        if err := xml.Unmarshal(data, manifest); err != nil {
-                return "", err
-        }
-        if manifest.Activity.Name != "android.app.NativeActivity" {
-                return "", fmt.Errorf("can only build an .apk for NativeActivity, not %q", manifest.Activity.Name)
-        }
-        libName := ""
-        for _, md := range manifest.Activity.MetaData {
-                if md.Name == "android.app.lib_name" {
-                        libName = md.Value
-                        break
-                }
-        }
-        if libName == "" {
-                return "", errors.New("AndroidManifest.xml missing meta-data android.app.lib_name")
-        }
-        return libName, nil
-}
-
-type manifestTmplData struct {
-        JavaPkgPath string
-        Name        string
-        LibName     string
-}
-
-var manifestTmpl = template.Must(template.New("manifest").Parse(`
-<manifest
-        xmlns:android="http://schemas.android.com/apk/res/android"
-        package="{{.JavaPkgPath}}"
-        android:versionCode="1"
-        android:versionName="1.0">
-
-        <uses-sdk android:minSdkVersion="9" />
-        <application android:label="{{.Name}}" android:hasCode="false" android:debuggable="true">
-        <activity android:name="android.app.NativeActivity"
-                android:label="{{.Name}}"
-                android:configChanges="orientation|keyboardHidden">
-                <meta-data android:name="android.app.lib_name" android:value="{{.LibName}}" />
-                <intent-filter>
-                        <action android:name="android.intent.action.MAIN" />
-                        <category android:name="android.intent.category.LAUNCHER" />
-                </intent-filter>
-        </activity>
-        </application>
-</manifest>`))