Drop android_n5x_swarming_rel to 100% experimental.

infra/config/cq.cfg

Index: infra/config/cq.cfg
diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index 8f371d15c103dfde7f8e6da1e71137f4bbd80fe7..5e0b4d0358f5459f59536f73c83dd9c6e6789644 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -33,7 +33,11 @@ verifiers {
       builders { name: "android_clang_dbg_recipe" }
       builders { name: "android_compile_dbg" }
       builders { name: "android_cronet" }
-      builders { name: "android_n5x_swarming_rel" }
+      builders {
+        # TODO(jbudorick): reenable ASAP; see crbug.com/672382
+        name: "android_n5x_swarming_rel"
+        experiment_percentage: 100
+      }
       builders { name: "cast_shell_android" }
       builders { name: "linux_android_rel_ng" }
     }