test_runner: Suppress validation messages on WPTServe too.

components/test_runner/test_interfaces.cc

Index: components/test_runner/test_interfaces.cc
diff --git a/components/test_runner/test_interfaces.cc b/components/test_runner/test_interfaces.cc
index d28293252be849740ba1132366dcd2cd33e72e1e..49d88a98977f3dbd429c5ed4233fede7ec0898bc 100644
--- a/components/test_runner/test_interfaces.cc
+++ b/components/test_runner/test_interfaces.cc
@@ -113,7 +113,8 @@ void TestInterfaces::ConfigureForTestWithURL(const blink::WebURL& test_url,
     test_runner_->setShouldDumpAsMarkup(true);
   }
   if (spec.find("/imported/wpt/") != std::string::npos ||
-      spec.find("/imported/csswg-test/") != std::string::npos)
+      spec.find("/imported/csswg-test/") != std::string::npos ||
+      spec.find("://web-platform.test") != std::string::npos)
     test_runner_->set_is_web_platform_tests_mode();
 }