Closed Issue: Action invocation fails when attribute routing is used and trace is also enabled [1138]

I have a simple setup which contains ValuesController decorated with attributed routes. I am seeing the following error when tracing is __enabled__.

Attached a standalone katana selfhost repro.

__Configuration & Controller__:
```
public void Configuration(IAppBuilder appBuilder)
{
var config = new HttpConfiguration();

config.MapHttpAttributeRoutes();

config.EnableSystemDiagnosticsTracing();

appBuilder.UseWebApi(config);
}

[RoutePrefix("api/values")]
public class ValuesController : ApiController
{
[HttpGet("")]
public IEnumerable<string> GetAll()
{
return new string[] { "value1", "value2" };
}

[HttpGet("{id}")]
public string GetSingle(int id)
{
return "value";
}
}
```

__Error__:
```
{"Message":"An error has occurred.","ExceptionMessage":"The given key was not present in the dictionary.","ExceptionType":"System.Collections.Generic.KeyNotFoundException","StackTrace":" at System.Collections.Generic.Dictionary`2.get_Item(TKey key)\r\n at System.Web.Http.Controllers.ApiControllerActionSelector.ActionSelectorCacheItem.FindActionUsingRouteAndQueryParameters(HttpControllerContext controllerContext, ReflectedHttpActionDescriptor[] actionsFound) in c:\\WebstackRuntime\\Runtime\\src\\System.Web.Http\\Controllers\\ApiControllerActionSelector.cs:line 335\r\n at System.Web.Http.Controllers.ApiControllerActionSelector.ActionSelectorCacheItem.SelectAction(HttpControllerContext controllerContext) in c:\\WebstackRuntime\\Runtime\\src\\System.Web.Http\\Controllers\\ApiControllerActionSelector.cs:line 157\r\n at System.Web.Http.Controllers.ApiControllerActionSelector.SelectAction(HttpControllerContext controllerContext) in c:\\WebstackRuntime\\Runtime\\src\\System.Web.Http\\Controllers\\ApiControllerActionSelector.cs:line 38\r\n at System.Web.Http.Tracing.Tracers.HttpActionSelectorTracer.<>c__DisplayClass2.<System.Web.Http.Controllers.IHttpActionSelector.SelectAction>b__0() in c:\\WebstackRuntime\\Runtime\\src\\System.Web.Http\\Tracing\\Tracers\\HttpActionSelectorTracer.cs:line 51\r\n at System.Web.Http.Tracing.ITraceWriterExtensions.TraceBeginEnd(ITraceWriter traceWriter, HttpRequestMessage request, String category, TraceLevel level, String operatorName, String operationName, Action`1 beginTrace, Action execute, Action`1 endTrace, Action`1 errorTrace) in c:\\WebstackRuntime\\Runtime\\src\\System.Web.Http\\Tracing\\ITraceWriterExtensions.cs:line 375\r\n at System.Web.Http.Tracing.Tracers.HttpActionSelectorTracer.System.Web.Http.Controllers.IHttpActionSelector.SelectAction(HttpControllerContext controllerContext) in c:\\WebstackRuntime\\Runtime\\src\\System.Web.Http\\Tracing\\Tracers\\HttpActionSelectorTracer.cs:line 44\r\n at System.Web.Http.ApiController.ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken) in c:\\WebstackRuntime\\Runtime\\src\\System.Web.Http\\ApiController.cs:line 200\r\n at System.Web.Http.Tracing.Tracers.HttpControllerTracer.<ExecuteAsyncCore>d__5.MoveNext() in c:\\WebstackRuntime\\Runtime\\src\\System.Web.Http\\Tracing\\Tracers\\HttpControllerTracer.cs:line 88\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n at System.Web.Http.Tracing.ITraceWriterExtensions.<TraceBeginEndAsyncCore>d__21`1.MoveNext() in c:\\WebstackRuntime\\Runtime\\src\\System.Web.Http\\Tracing\\ITraceWriterExtensions.cs:line 535\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__0.MoveNext() in c:\\WebstackRuntime\\Runtime\\src\\System.Web.Http\\Dispatcher\\HttpControllerDispatcher.cs:line 69"}
```

Comments: Verified.