Remove w3c check HttpClient (#3235)

* remove w3c check

* unnecessary usings

src/OpenTelemetry.Instrumentation.Http/Implementation/HttpHandlerDiagnosticListener.cs

@@ -16,11 +16,9 @@
 
 using System;
 using System.Diagnostics;
-using System.Globalization;
 using System.Net.Http;
 using System.Net.Sockets;
 using System.Reflection;
-using System.Runtime.Versioning;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using OpenTelemetry.Context.Propagation;
@@ -41,27 +39,11 @@ internal sealed class HttpHandlerDiagnosticListener : ListenerHandler
         private readonly PropertyFetcher<HttpResponseMessage> stopResponseFetcher = new("Response");
         private readonly PropertyFetcher<Exception> stopExceptionFetcher = new("Exception");
         private readonly PropertyFetcher<TaskStatus> stopRequestStatusFetcher = new("RequestTaskStatus");
-        private readonly bool httpClientSupportsW3C;
         private readonly HttpClientInstrumentationOptions options;
 
         public HttpHandlerDiagnosticListener(HttpClientInstrumentationOptions options)
             : base("HttpHandlerDiagnosticListener")
         {
-            var framework = Assembly
-                .GetEntryAssembly()?
-                .GetCustomAttribute<TargetFrameworkAttribute>()?
-                .FrameworkName;
-
-            // Depending on the .NET version/flavor this will look like
-            // '.NETCoreApp,Version=v3.0', '.NETCoreApp,Version = v2.2' or '.NETFramework,Version = v4.7.1'
-
-            if (framework != null)
-            {
-                var match = CoreAppMajorVersionCheckRegex.Match(framework);
-
-                this.httpClientSupportsW3C = match.Success && int.Parse(match.Groups[1].Value, CultureInfo.InvariantCulture) >= 3;
-            }
-
             this.options = options;
         }
 
@@ -98,7 +80,7 @@ public override void OnStartActivity(Activity activity, object payload)
 
             // Propagate context irrespective of sampling decision
             var textMapPropagator = Propagators.DefaultTextMapPropagator;
-            if (!(this.httpClientSupportsW3C && textMapPropagator is TraceContextPropagator))
+            if (textMapPropagator is not TraceContextPropagator)
             {
                 textMapPropagator.Inject(new PropagationContext(activity.Context, Baggage.Current), request, HttpRequestMessageContextPropagation.HeaderValueSetter);
             }