Introduce an 'ENABLE_WEBSOCKETS' define in //net.

net/url_request/url_request_job_manager.cc

Index: net/url_request/url_request_job_manager.cc
diff --git a/net/url_request/url_request_job_manager.cc b/net/url_request/url_request_job_manager.cc
index 092708fc86a10b872071b5a3db267a3a25d318df..15790a74c860be9d6f3d48f37369c8dcd4e9239d 100644
--- a/net/url_request/url_request_job_manager.cc
+++ b/net/url_request/url_request_job_manager.cc
@@ -30,13 +30,13 @@ struct SchemeToFactory {
 }  // namespace
 
 static const SchemeToFactory kBuiltinFactories[] = {
-  { "http", URLRequestHttpJob::Factory },
-  { "https", URLRequestHttpJob::Factory },
+    {"http", URLRequestHttpJob::Factory},
+    {"https", URLRequestHttpJob::Factory},
 
-#if !defined(OS_IOS)
-  { "ws", URLRequestHttpJob::Factory },
-  { "wss", URLRequestHttpJob::Factory },
-#endif  // !defined(OS_IOS)
+#if defined(ENABLE_WEBSOCKETS)
+    {"ws", URLRequestHttpJob::Factory},
+    {"wss", URLRequestHttpJob::Factory},
+#endif  // defined(ENABLE_WEBSOCKETS)
 };
 
 // static