Bug 1194860 - Remove dom/imptests; r=jgraham

This leaves the testharness files, because they are used in mochitest-chrome
tests in dom/animation/test.

Differential Revision: https://phabricator.services.mozilla.com/D49132

--HG--
extra : moz-landing-system : lando

Author: Ms2ger

.eslintignore

@@ -152,7 +152,6 @@ devtools/server/tests/unit/xpcshell_debugging_script.js
 
 # Third-party
 dom/canvas/test/webgl-conf/
-dom/imptests/
 dom/media/webaudio/test/blink/
 dom/media/webvtt/
 dom/svg/test/test_nonAnimStrings.xhtml

.flake8

@@ -9,7 +9,6 @@ exclude =
     dom/browser-element,
     dom/canvas,
     dom/encoding,
-    dom/imptests,
     dom/security,
     dom/websocket,
     gfx/tests,

browser/components/resistfingerprinting/test/chrome/chrome.ini

@@ -1,6 +1 @@
-[DEFAULT]
-support-files =
-  ../../../../../dom/imptests/testharness.js
-  ../../../../../dom/imptests/testharnessreport.js
-
-[test_bug1409973_date_time_format.html]
+[test_bug1409973_date_time_format.html]