Revert "[browser][MT] troubleshooting deadlocks (dotnet#104539)"

This reverts commit 844e6fe.

Author: matouskozak

src/libraries/System.Runtime/tests/System.Threading.Tasks.Tests/MethodCoverage.cs

@@ -295,7 +295,6 @@ public static async Task Task_WhenAny_TwoTasks_WakesOnFirstCompletion()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/99500", TestPlatforms.Browser)]
         public static void CancellationTokenRegitration()
         {
             ManualResetEvent mre = new ManualResetEvent(false);
@@ -313,7 +312,6 @@ public static void CancellationTokenRegitration()
         /// verify that the taskawaiter.UnsafeOnCompleted is invoked
         /// </summary>
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/99500", TestPlatforms.Browser)]
         public static void TaskAwaiter()
         {
             ManualResetEvent mre = new ManualResetEvent(false);

src/libraries/System.Runtime/tests/System.Threading.Tasks.Tests/Task/AsyncEnumerableToBlockingEnumerableTests.cs

@@ -70,7 +70,6 @@ static async IAsyncEnumerable<int> CreateSourceEnumerable()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/99519", TestPlatforms.Browser)]
         public static void AsyncEnumerableWithDelays()
         {
             var source = new InstrumentedAsyncEnumerable<int>(CreateSourceEnumerable());
@@ -105,7 +104,6 @@ static async IAsyncEnumerable<int> CreateSourceEnumerable()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/99519", TestPlatforms.Browser)]
         public static void AsyncEnumerableWithException()
         {
             var source = new InstrumentedAsyncEnumerable<int>(CreateSourceEnumerable());
@@ -134,7 +132,6 @@ static async IAsyncEnumerable<int> CreateSourceEnumerable()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/99519", TestPlatforms.Browser)]
         public static void AsyncEnumerableWithCancellation()
         {
             var source = new InstrumentedAsyncEnumerable<string>(CreateSourceEnumerable());

src/libraries/System.Runtime/tests/System.Threading.Tasks.Tests/Task/TaskContinueWithTests.cs

@@ -1076,7 +1076,6 @@ public static void RunContinuationCancelTest_State()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/99519", TestPlatforms.Browser)]
         public static void TestNoDeadlockOnContinueWith()
         {
             Debug.WriteLine("TestNoDeadlockOnContinueWith:  shouldn't deadlock if it passes.");
@@ -1256,7 +1255,6 @@ public static void LongContinuationChain_Unwrap_DoesNotStackOverflow()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/99519", TestPlatforms.Browser)]
         public static void LongContinuationChain_Await_DoesNotStackOverflow()
         {
             const int DiveDepth = 12_000;

src/libraries/System.Threading/tests/MutexTests.cs

@@ -661,7 +661,6 @@ private static void IncrementValueInFileNTimes(Mutex mutex, string fileName, int
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/96191", TestPlatforms.Browser)]
         public void NamedMutex_ThreadExitDisposeRaceTest()
         {
             var mutexName = Guid.NewGuid().ToString("N");

src/libraries/System.Threading/tests/SemaphoreSlimTests.cs

@@ -90,7 +90,6 @@ public static void RunSemaphoreSlimTest1_WaitAsync()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/99519", TestPlatforms.Browser)]
         public static void RunSemaphoreSlimTest1_WaitAsync_NegativeCases()
         {
             // Invalid timeout