fix several lint warnings

Summary: fix some ling warnings from several files
Closes https://github.com/facebook/react-native/pull/4450

Reviewed By: svcscm

Differential Revision: D2707606

Pulled By: mkonicek

fb-gh-sync-id: 410ccacf061ac7b0f6e44d1a5e4621a9d1d606fc

Libraries/Components/MapView/MapView.js

@@ -232,7 +232,7 @@ var MapView = React.createClass({
        * @platform ios
        */
       image: Image.propTypes.source,
-      
+
       /**
        * annotation id
        */

Libraries/Components/View/ViewStylePropTypes.js

@@ -48,7 +48,7 @@ var ViewStylePropTypes = {
   shadowOpacity: ReactPropTypes.number,
   shadowRadius: ReactPropTypes.number,
   /**
-   * (Android-only) Sets the elevation of a view, using Android's underlying 
+   * (Android-only) Sets the elevation of a view, using Android's underlying
    * [elevation API](https://developer.android.com/training/material/shadows-clipping.html#Elevation).
    * This adds a drop shadow to the item and affects z-order for overlapping views.
    * Only supported on Android 5.0+, has no effect on earlier versions.

Libraries/JavaScriptAppEngine/Initialization/InitializeJavaScriptAppEngine.js

@@ -53,7 +53,7 @@ function setUpConsole() {
  * For more info on that particular case, see:
  * https://github.com/facebook/react-native/issues/934
  */
-function polyfillGlobal(name, newValue, scope=GLOBAL) {
+function polyfillGlobal(name, newValue, scope = GLOBAL) {
   var descriptor = Object.getOwnPropertyDescriptor(scope, name) || {
     // jest for some bad reasons runs the polyfill code multiple times. In jest
     // environment, XmlHttpRequest doesn't exist so getOwnPropertyDescriptor

Libraries/LinkingIOS/LinkingIOS.js

@@ -130,7 +130,7 @@ class LinkingIOS {
    * Determine whether or not an installed app can handle a given URL.
    * The callback function will be called with `bool supported` as the only argument
    *
-   * NOTE: As of iOS 9, your app needs to provide a `LSApplicationQueriesSchemes` key 
+   * NOTE: As of iOS 9, your app needs to provide a `LSApplicationQueriesSchemes` key
    * inside `Info.plist`.
    */
   static canOpenURL(url: string, callback: Function) {

Libraries/Network/XMLHttpRequest.ios.js

@@ -13,7 +13,6 @@
 
 var FormData = require('FormData');
 var RCTNetworking = require('RCTNetworking');
-var RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
 
 var XMLHttpRequestBase = require('XMLHttpRequestBase');
 

Libraries/Picker/PickerIOS.ios.js

@@ -15,13 +15,11 @@
 var NativeMethodsMixin = require('NativeMethodsMixin');
 var React = require('React');
 var ReactChildren = require('ReactChildren');
-var ReactNativeViewAttributes = require('ReactNativeViewAttributes');
 var RCTPickerIOSConsts = require('NativeModules').UIManager.RCTPicker.Constants;
 var StyleSheet = require('StyleSheet');
 var View = require('View');
 
 var requireNativeComponent = require('requireNativeComponent');
-var merge = require('merge');
 
 var PICKER = 'picker';
 

Libraries/RCTTest/SnapshotViewIOS.ios.js

@@ -11,7 +11,6 @@
  */
 'use strict';
 
-var Platform = require('Platform');
 var React = require('React');
 var StyleSheet = require('StyleSheet');
 var { TestModule, UIManager } = require('NativeModules');