Use the NuGet version of System.Net.Http

source/ChromeDevTools/project.json

@@ -30,10 +30,10 @@
     },
     "net45": {
       "dependencies": {
-        "WebSocket4Net": "0.14.1"
+        "WebSocket4Net": "0.14.1",
+        "System.Net.Http": "4.1.0"
       },
       "frameworkAssemblies": {
-        "System.Net.Http": "4.0.0.0",
         "System.Runtime.Serialization": "4.0.0.0"
       }
     }