Remove the unspecified dependency methods

lib/WebViewBridge/index.android.js

@@ -15,8 +15,6 @@
 
 var React = require('react');
 var ReactNative = require('react-native');
-var invariant = require('invariant');
-var keyMirror = require('keymirror');
 var resolveAssetSource = require('react-native/Libraries/Image/resolveAssetSource');
 
 var {
@@ -37,11 +35,11 @@ var { PropTypes } = React;
 
 var RCT_WEBVIEWBRIDGE_REF = 'webviewbridge';
 
-var WebViewBridgeState = keyMirror({
+var WebViewBridgeState = {
   IDLE: null,
   LOADING: null,
   ERROR: null,
-});
+};
 
 var RCTWebViewBridge = requireNativeComponent('RCTWebViewBridge', WebViewBridge);
 
@@ -67,7 +65,7 @@ var WebViewBridge = React.createClass({
     };
   },
 
-  
+
   componentWillMount: function() {
     DeviceEventEmitter.addListener("webViewBridgeMessage", (body) => {
       const { onBridgeMessage } = this.props;

lib/WebViewBridge/index.ios.js

@@ -28,9 +28,6 @@ import {
   findNodeHandle
 } from 'react-native'
 
-import invariant from 'fbjs/lib/invariant'
-import keyMirror from 'fbjs/lib/keyMirror'
-
 import resolveAssetSource from 'react-native/Libraries/Image/resolveAssetSource';
 import processDecelerationRate from 'react-native/Libraries/Components/ScrollView/processDecelerationRate'
 import deprecatedPropType from 'react-native/Libraries/Utilities/deprecatedPropType'
@@ -42,20 +39,20 @@ const { WebViewBridgeManager } = NativeModules
 var BGWASH = 'rgba(255,255,255,0.8)';
 var RCT_WEBVIEW_REF = 'webview';
 
-var WebViewState = keyMirror({
+var WebViewState = {
   IDLE: null,
   LOADING: null,
   ERROR: null,
-});
+};
 
-const NavigationType = keyMirror({
+const NavigationType = {
   click: true,
   formsubmit: true,
   backforward: true,
   reload: true,
   formresubmit: true,
   other: true,
-});
+};
 
 const JSNavigationScheme = 'react-js-navigation';
 
@@ -361,10 +358,9 @@ class WebView extends React.Component {
       otherView = (this.props.renderLoading || defaultRenderLoading)();
     } else if (this.state.viewState === WebViewState.ERROR) {
       var errorEvent = this.state.lastErrorEvent;
-      invariant(
-        errorEvent != null,
-        'lastErrorEvent expected to be non-null'
-      );
+      if (errorEvent != null) {
+        throw new Error('lastErrorEvent expected to be non-null');
+      }
       otherView = (this.props.renderError || defaultRenderError)(
         errorEvent.domain,
         errorEvent.code,