[test] Remove 'testDOMWarnings' from browser tests

Test was removed upstream with https://crrev.com/c/6434430.

R=alexrudenko@chromium.org

Bug: 331650494
Change-Id: I7d8361888a5f5adfbeaae4a38e83e024924b25ef
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6440916
Reviewed-by: Alex Rudenko <alexrudenko@chromium.org>
Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>
Auto-Submit: Simon Zünd <szuend@chromium.org>

Author: szuend

front_end/Tests.js

@@ -1165,13 +1165,6 @@
     }
   };
 
-  TestSuite.prototype.testDOMWarnings = function() {
-    const messages = SDK.ConsoleModel.ConsoleModel.allMessagesUnordered();
-    this.assertEquals(1, messages.length);
-    const expectedPrefix = '[DOM] Found 2 elements with non-unique id #dup:';
-    this.assertTrue(messages[0].messageText.startsWith(expectedPrefix));
-  };
-
   TestSuite.prototype.waitForTestResultsInConsole = function() {
     const messages = SDK.ConsoleModel.ConsoleModel.allMessagesUnordered();
     for (let i = 0; i < messages.length; ++i) {