Move tabs to util directory

src/sidebar/components/sidebar-content.js

@@ -2,7 +2,7 @@
 
 const events = require('../events');
 const isThirdPartyService = require('../util/is-third-party-service');
-const tabs = require('../tabs');
+const tabs = require('../util/tabs');
 
 // @ngInject
 function SidebarContentController(

src/sidebar/services/root-thread.js

@@ -4,7 +4,7 @@ const buildThread = require('../build-thread');
 const events = require('../events');
 const memoize = require('../util/memoize');
 const metadata = require('../util/annotation-metadata');
-const tabs = require('../tabs');
+const tabs = require('../util/tabs');
 const uiConstants = require('../ui-constants');
 
 function truthyKeys(map) {

src/sidebar/tabs.js → src/sidebar/util/tabs.js

 'use strict';
 
-// Selectors that calculate the annotation counts displayed in tab headings
-// and determine which tab an annotation should be displayed in.
+// Functions that determine which tab an annotation should be displayed in.
 
-const metadata = require('./util/annotation-metadata');
-const uiConstants = require('./ui-constants');
+const metadata = require('./annotation-metadata');
+const uiConstants = require('../ui-constants');
 
 /**
  * Return the tab in which an annotation should be displayed.

src/sidebar/test/tabs-test.js → src/sidebar/util/test/tabs-test.js

 'use strict';
 
-const fixtures = require('./annotation-fixtures');
-const uiConstants = require('../ui-constants');
+const fixtures = require('../../test/annotation-fixtures');
+const uiConstants = require('../../ui-constants');
 const tabs = require('../tabs');
-const unroll = require('../../shared/test/util').unroll;
+const unroll = require('../../../shared/test/util').unroll;
 
 describe('tabs', function() {
   describe('tabForAnnotation', function() {