Disable debug layer logger

This logger is producing too much output on Windows and causing
Chromium's gtest harness to kill the tests.

Tbr=cwallez@chromium.org
No-Try: true
Bug: chromium:1130483
Change-Id: I1990bc800bbb7eda62901d14f656375c30fbeef2
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28740
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>

src/tests/DawnTest.cpp

@@ -187,11 +187,6 @@ void DawnTestEnvironment::SetEnvironment(DawnTestEnvironment* env) {
 DawnTestEnvironment::DawnTestEnvironment(int argc, char** argv) {
     ParseArgs(argc, argv);
 
-    if (mEnableBackendValidation) {
-        mPlatformDebugLogger =
-            std::unique_ptr<utils::PlatformDebugLogger>(utils::CreatePlatformDebugLogger());
-    }
-
     // Create a temporary instance to select available and preferred adapters. This is done before
     // test instantiation so GetAvailableAdapterTestParamsForBackends can generate test
     // parameterizations all selected adapters. We drop the instance at the end of this function