Fix mispelled class name.

src/Microsoft.AspNet.PipelineCore/DefaultHttpContext.cs

@@ -36,7 +36,7 @@ namespace Microsoft.AspNet.PipelineCore
         public DefaultHttpContext()
             : this(new FeatureCollection())
         {
-            SetFeature<IHttpRequestFeature>(new DeafultHttpRequestFeature());
+            SetFeature<IHttpRequestFeature>(new DefaultHttpRequestFeature());
             SetFeature<IHttpResponseFeature>(new DefaultHttpResponseFeature());
         }
 

src/Microsoft.AspNet.PipelineCore/DefaultHttpRequestFeature.cs

@@ -8,9 +8,9 @@ using Microsoft.AspNet.HttpFeature;
 
 namespace Microsoft.AspNet.PipelineCore
 {
-    public class DeafultHttpRequestFeature : IHttpRequestFeature
+    public class DefaultHttpRequestFeature : IHttpRequestFeature
     {
-        public DeafultHttpRequestFeature()
+        public DefaultHttpRequestFeature()
         {
             Headers = new Dictionary<string, string[]>(StringComparer.OrdinalIgnoreCase);
             Body = Stream.Null;

src/Microsoft.AspNet.PipelineCore/Microsoft.AspNet.PipelineCore.kproj

@@ -27,7 +27,7 @@
     <Compile Include="Collections\ReadableStringCollection.cs" />
     <Compile Include="Collections\RequestCookiesCollection.cs" />
     <Compile Include="Collections\ResponseCookies.cs" />
-    <Compile Include="DeafultHttpRequestFeature.cs" />
+    <Compile Include="DefaultHttpRequestFeature.cs" />
     <Compile Include="DefaultHttpResponseFeature.cs" />
     <Compile Include="FormFeature.cs" />
     <Compile Include="ItemsFeature.cs" />