Rescope chunkManifest var

Author: TuckerCowie

lib/ChunkManifestPlugin.js

@@ -14,12 +14,12 @@ ChunkManifestPlugin.prototype.apply = function(compiler) {
   var manifestVariable = this.manifestVariable;
   var inlineManifest = this.inlineManifest;
   var oldChunkFilename;
+  var chunkManifest;
 
   compiler.plugin("this-compilation", function(compilation) {
     var mainTemplate = compilation.mainTemplate;
     mainTemplate.plugin("require-ensure", function(_, chunk, hash) {
       var filename = this.outputOptions.chunkFilename || this.outputOptions.filename;
-      var chunkManifest;
 
       if (filename) {
         chunkManifest = [chunk].reduce(function registerChunk(manifest, c) {