Adds NetInfo v3 Web API to Blink.

LayoutTests/fast/dom/Window/resources/window-property-collector.js

 function collectProperties()
 {
     // Collect properties of the top-level window, since touching the properties
     // of a DOMWindow affects its internal C++ state.
     collectPropertiesHelper(window, []);
 
     propertiesToVerify.sort(function (a, b)
     {
         if (a.property < b.property)
             return -1
@@ skipping 46 matching lines @@
         expected = "'about:'";
         break;
     case "navigator.appCodeName":
     case "navigator.appName":
     case "navigator.language":
     case "navigator.onLine":
     case "navigator.platform":
     case "navigator.product":
     case "navigator.productSub":
     case "navigator.vendor":
+    case "navigator.connection.type":
         expected = "window." + propertyPath;
         break;
     case "screen.orientation":
         expected = "'portrait-primary'";
         break;
     }
 
     insertExpectedResult(path, expected);
 }
 
@@ skipping 18 matching lines @@
         } else if (type == "string") {
             emitExpectedResult(path, "''");
         } else if (type == "number") {
             emitExpectedResult(path, "0");
         } else if (type == "boolean") {
             emitExpectedResult(path, "false");
         }
         path.pop();
     }
 }