AOSP master doesn't have "cmd".

Change-Id: I0f524b779a623a9e2db923fd9003b102460ae46f
diff --git a/transport.cpp b/transport.cpp
index ad607e9..9d50854 100644
--- a/transport.cpp
+++ b/transport.cpp
@@ -784,7 +784,9 @@
     // Local static allocation to avoid global non-POD variables.
     static const FeatureSet* features = new FeatureSet{
         kFeatureShell2,
-        kFeatureCmd
+        // Internal master has 'cmd'. AOSP master doesn't.
+        // kFeatureCmd
+
         // Increment ADB_SERVER_VERSION whenever the feature list changes to
         // make sure that the adb client and server features stay in sync
         // (http://b/24370690).