PDFExtensionTest: Stop using chrome:// URL to load mock-interactions.js

chrome/test/data/pdf/test_util.js

Index: chrome/test/data/pdf/test_util.js
diff --git a/chrome/test/data/pdf/test_util.js b/chrome/test/data/pdf/test_util.js
index 7fff3fa3862aabca15511bdc155f5eb3966230ac..9efead405cec920348ba1c6caf6174aef2871033 100644
--- a/chrome/test/data/pdf/test_util.js
+++ b/chrome/test/data/pdf/test_util.js
@@ -104,27 +104,3 @@ function MockDocumentDimensions(width, height) {
     this.pageDimensions = [];
   };
 }
-
-function importHTML(src) {
-  var link = document.createElement('link');
-  var promise = new Promise(function(resolve, reject) {
-    link.onload = resolve;
-    link.onerror = reject;
-  });
-  link.rel = 'import';
-  link.href = src;
-  document.head.appendChild(link);
-  return promise;
-}
-
-/**
- * Import iron-test-helpers into the test document.
- * @example
- *   importTestHelpers().then(function() {
- *     chrome.test.runTests(...);
- *   })
- */
-function importTestHelpers() {
-  return importHTML('chrome://resources/polymer/v1_0/iron-test-helpers/' +
-      'iron-test-helpers.html');
-}