depend on vinyl directly

Change-Id: I531633ee69fec1c7fc2022a04e0c91e4201dc9ed

Author: samthor

lib/gulp.js

@@ -48,11 +48,12 @@ module.exports = function() {
   const compile = require('../compile');
   const logger = require('../logger');
   const gutil = require('gulp-util');
+  const path = require('path');
+  const File = require('vinyl');
   const PluginError = gutil.PluginError;
   const Transform = require('stream').Transform;
   const PLUGIN_NAME = 'gulp-google-closure-compiler-js';
   const DEFAULT_OUTPUT_PATH = 'compiled.js';
-  const path = require('path');
 
   class CompilationStream extends Transform {
     constructor(compilationOptions, pluginOptions) {
@@ -99,7 +100,7 @@ module.exports = function() {
         this.emit('error', new PluginError(this.pluginName_, message));
       }
 
-      const file = new gutil.File({
+      const file = new File({
         path: outputFile || DEFAULT_OUTPUT_PATH,
         contents: new Buffer(output.compiledCode),
       });