Test - Renable JavascriptBinding IntegrationTestFacts

- Now that https://bitbucket.org/chromiumembedded/cef/issues/3260/support-reconnect-of-mojo-frame-channel has been resovled see if the
tests will run on appveyor reliable
- Use a new RequestContext to isolate the unreliable test cases.

Issue #3867

CefSharp.Test/JavascriptBinding/IntegrationTestFacts.cs

@@ -74,11 +74,13 @@ public async Task LoadJavaScriptBindingQunitTestsSuccessfulCompletion()
         }
 #else
 
-        // Issue https://github.com/cefsharp/CefSharp/issues/3867
-        [SkipIfRunOnAppVeyorFact]
+        [Fact]
         public async Task LoadJavaScriptBindingQunitTestsSuccessfulCompletion()
         {
-            using (var browser = new ChromiumWebBrowser(CefExample.BindingTestUrl, automaticallyCreateBrowser: false))
+            var requestContext = new RequestContext();
+            requestContext.RegisterSchemeHandlerFactory("https", CefExample.ExampleDomain, new CefSharpSchemeHandlerFactory());
+
+            using (var browser = new ChromiumWebBrowser(CefExample.BindingTestUrl, requestContext: requestContext, automaticallyCreateBrowser: false))
             {
                 //TODO: Extract this into some sort of helper setup method
                 var bindingOptions = BindingOptions.DefaultBinder;
@@ -160,8 +162,7 @@ public async Task LoadJavaScriptBindingAsyncTaskQunitTestsSuccessfulCompletion()
             }
         }
 
-        [SkipIfRunOnAppVeyorFact()]
-        //Skipping Issue https://github.com/cefsharp/CefSharp/issues/3867
+        [Fact]
         public async Task LoadLegacyJavaScriptBindingQunitTestsSuccessfulCompletion()
         {
             var requestContext = new RequestContext();