removed unused code: _numPrependedModules

Summary:
cc davidaurelio
Closes https://github.com/facebook/react-native/pull/7873

Differential Revision: D3371406

Pulled By: javache

fbshipit-source-id: 72ed3838a88022ae5c0832dcca5abda75f18dbe1

react-packager/src/Bundler/Bundle.js

@@ -22,7 +22,6 @@ class Bundle extends BundleBase {
     this._sourceMap = false;
     this._sourceMapUrl = sourceMapUrl;
     this._shouldCombineSourceMaps = false;
-    this._numPrependedModules = 0;
     this._numRequireCalls = 0;
     this._dev = dev;
     this._minify = minify;
@@ -53,10 +52,6 @@ class Bundle extends BundleBase {
     });
   }
 
-  setNumPrependedModules(n) {
-    this._numPrependedModules = n;
-  }
-
   finalize(options) {
     options = options || {};
     if (options.runMainModule) {
@@ -277,7 +272,6 @@ class Bundle extends BundleBase {
     return {
       ...super.toJSON(),
       sourceMapUrl: this._sourceMapUrl,
-      numPrependedModules: this._numPrependedModules,
       numRequireCalls: this._numRequireCalls,
       shouldCombineSourceMaps: this._shouldCombineSourceMaps,
     };
@@ -287,7 +281,6 @@ class Bundle extends BundleBase {
     const bundle = new Bundle({sourceMapUrl: json.sourceMapUrl});
 
     bundle._sourceMapUrl = json.sourceMapUrl;
-    bundle._numPrependedModules = json.numPrependedModules;
     bundle._numRequireCalls = json.numRequireCalls;
     bundle._shouldCombineSourceMaps = json.shouldCombineSourceMaps;
 

react-packager/src/Bundler/index.js

@@ -250,11 +250,6 @@ class Bundler {
   }) {
     const onResolutionResponse = response => {
       bundle.setMainModuleId(response.getModuleId(getMainModule(response)));
-      if (bundle.setNumPrependedModules) {
-        bundle.setNumPrependedModules(
-          response.numPrependedDependencies + moduleSystemDeps.length
-        );
-      }
       if (entryModuleOnly) {
         response.dependencies = response.dependencies.filter(module =>
           module.path.endsWith(entryFile)