Don't use a util function for a thing that exists 1x in the code

modules/core/file_fetcher.js

@@ -1,4 +1,3 @@
-import { utilFetchJson } from '../util/util';
 import parseVersion from 'vparse';
 // Double check this resolves to iD's `package.json`
 import packageJSON from '../../package.json';
@@ -60,7 +59,15 @@ export function coreFileFetcher() {
 
     let prom = _inflight[url];
     if (!prom) {
-      _inflight[url] = prom = utilFetchJson(url)
+      _inflight[url] = prom = fetch(url)
+        .then(response => {
+          // fetch in PhantomJS tests may return ok=false and status=0 even if it's okay
+          if ((!response.ok && response.status !== 0) || !response.json) {
+            throw new Error(response.status + ' ' + response.statusText);
+          }
+          if (response.status === 204 || response.status === 205) return;  // No Content, Reset Content
+          return response.json();
+        })
         .then(result => {
           delete _inflight[url];
           if (!result) {

modules/util/index.js

@@ -27,7 +27,6 @@ export { utilEntityOrMemberSelector } from './util';
 export { utilEntityOrDeepMemberSelector } from './util';
 export { utilEntitySelector } from './util';
 export { utilFastMouse } from './util';
-export { utilFetchJson } from './util';
 export { utilFunctor } from './util';
 export { utilGetAllNodes } from './util';
 export { utilGetSetValue } from './get_set_value';

modules/util/util.js

@@ -580,14 +580,3 @@ export function utilUnicodeCharsCount(str) {
 export function utilUnicodeCharsTruncated(str, limit) {
     return Array.from(str).slice(0, limit).join('');
 }
-
-// Variation of d3.json (https://github.com/d3/d3-fetch/blob/master/src/json.js)
-export function utilFetchJson(resourse, init) {
-    return fetch(resourse, init)
-        .then((response) => {
-            // fetch in PhantomJS tests may return ok=false and status=0 even if it's okay
-            if ((!response.ok && response.status !== 0) || !response.json) throw new Error(response.status + ' ' + response.statusText);
-            if (response.status === 204 || response.status === 205) return;
-            return response.json();
-        });
-}