Remove unused code

Summary:
There are some unused imports and variables. This was flagged by running
```
$ js1 lint --only "no-unused-vars: [1, {vars: 'all', args: 'none', ignoreRestSiblings: true}]" ~/fbsource/xplat/js/react-native-github --only "react/jsx-uses-vars" --only "react/jsx-uses-react" --fast
```

Changelog:
Internal

Reviewed By: zackargyle, JoshuaGross

Differential Revision: D17724836

fbshipit-source-id: 2b6a44f55c878d659c9c23f5878ba34f21f8bb69

Libraries/BugReporting/BugReporting.js

@@ -11,7 +11,6 @@
 'use strict';
 
 const RCTDeviceEventEmitter = require('../EventEmitter/RCTDeviceEventEmitter');
-const infoLog = require('../Utilities/infoLog');
 
 import type EmitterSubscription from '../vendor/emitter/EmitterSubscription';
 import NativeBugReporting from './NativeBugReporting';

Libraries/Components/RefreshControl/RefreshControl.js

@@ -13,8 +13,6 @@
 const Platform = require('../../Utilities/Platform');
 const React = require('react');
 
-const nullthrows = require('nullthrows');
-
 import type {ColorValue} from '../../StyleSheet/StyleSheetTypes';
 import type {ViewProps} from '../View/ViewPropTypes';
 import AndroidSwipeRefreshLayoutNativeComponent from './AndroidSwipeRefreshLayoutNativeComponent';

Libraries/Components/ScrollView/ScrollView.js

@@ -29,7 +29,6 @@ const requireNativeComponent = require('../../ReactNative/requireNativeComponent
 const resolveAssetSource = require('../../Image/resolveAssetSource');
 const splitLayoutProps = require('../../StyleSheet/splitLayoutProps');
 
-import type {NativeMethodsMixinType} from '../../Renderer/shims/ReactNativeTypes';
 import type {EdgeInsetsProp} from '../../StyleSheet/EdgeInsetsPropType';
 import type {PointProp} from '../../StyleSheet/PointPropType';
 import type {ViewStyleProp} from '../../StyleSheet/StyleSheet';

Libraries/Inspector/Inspector.js

@@ -204,7 +204,6 @@ class Inspector extends React.Component<
 
     if (this.state.devtoolsAgent) {
       // Skip host leafs
-      const offsetFromLeaf = hierarchy.length - 1 - selection;
       this.state.devtoolsAgent.selectNode(touchedViewTag);
     }
 

Libraries/Lists/SectionList.js

@@ -11,7 +11,6 @@
 
 const Platform = require('../Utilities/Platform');
 const React = require('react');
-const ScrollView = require('../Components/ScrollView/ScrollView');
 const VirtualizedSectionList = require('./VirtualizedSectionList');
 
 import type {ScrollResponderType} from '../Components/ScrollView/ScrollView';

Libraries/Modal/Modal.js

@@ -20,7 +20,6 @@ const View = require('../Components/View/View');
 
 import type {ViewProps} from '../Components/View/ViewPropTypes';
 import type {DirectEventHandler} from '../Types/CodegenTypes';
-import type {SyntheticEvent} from '../Types/CoreEventTypes';
 import type EmitterSubscription from '../vendor/emitter/EmitterSubscription';
 import RCTModalHostView from './RCTModalHostViewNativeComponent';
 /**

index.js

@@ -92,7 +92,6 @@ import typeof RCTNativeAppEventEmitter from './Libraries/EventEmitter/RCTNativeA
 import typeof NativeModules from './Libraries/BatchedBridge/NativeModules';
 import typeof Platform from './Libraries/Utilities/Platform';
 import typeof processColor from './Libraries/StyleSheet/processColor';
-import typeof requireNativeComponent from './Libraries/ReactNative/requireNativeComponent';
 import typeof RootTagContext from './Libraries/ReactNative/RootTagContext';
 import typeof DeprecatedColorPropType from './Libraries/DeprecatedPropTypes/DeprecatedColorPropType';
 import typeof DeprecatedEdgeInsetsPropType from './Libraries/DeprecatedPropTypes/DeprecatedEdgeInsetsPropType';

packages/react-native-codegen/src/SchemaValidator.js

@@ -32,8 +32,6 @@ function getErrors(schema: SchemaType): $ReadOnlyArray<string> {
         return;
       }
 
-      const component = module.components[componentName];
-
       if (!componentModules.has(componentName)) {
         componentModules.set(componentName, []);
       }