GTTF: convert some tests in chrome to use EmbeddedTestServer patch nr 1

chrome/test/data/extensions/api_test/app_process/path3/iframe.html

Index: chrome/test/data/extensions/api_test/app_process/path3/iframe.html
diff --git a/chrome/test/data/extensions/api_test/app_process/path3/iframe.html b/chrome/test/data/extensions/api_test/app_process/path3/iframe.html
index e152dab2f6cdf46d1f0b4439e5fbfeb4e6769de2..6a29b410c138935a7dca708e7f7dee1306f669a5 100644
--- a/chrome/test/data/extensions/api_test/app_process/path3/iframe.html
+++ b/chrome/test/data/extensions/api_test/app_process/path3/iframe.html
@@ -1,7 +1,7 @@
 <script>
   // Open popup to another normal web page, same-origin and non-app.
   window.open(
-      '/files/extensions/api_test/app_process/path3/empty.html',
+      '/extensions/api_test/app_process/path3/empty.html',
       '',
       // Small enough that a popup will be created even on Chrome OS
       'width=200,height=200');