ONC: Fix handling of invalid proxy scheme.

chromeos/test/data/network/proxy_config_from_onc.json

Index: chromeos/test/data/network/proxy_config_from_onc.json
diff --git a/chromeos/test/data/network/proxy_config_from_onc.json b/chromeos/test/data/network/proxy_config_from_onc.json
new file mode 100644
index 0000000000000000000000000000000000000000..a798702cc2071e6bd1e62aaddba62113cddf840d
--- /dev/null
+++ b/chromeos/test/data/network/proxy_config_from_onc.json
@@ -0,0 +1,22 @@
+[
+  { "ONC_ProxySettings": {
+      "Type": "PAC",
+      "PAC": "proxycfg.my.domain.com"
+    },
+    "ProxyConfig": {
+      "mode":"pac_script",
+      "pac_mandatory":false,
+      "pac_url":"http://proxycfg.my.domain.com/"
+    }
+  },
+  { "ONC_ProxySettings": {
+      "Type": "PAC",
+      "PAC": "proxycfg.my.domain.com/proxy.dat"
+    },
+    "ProxyConfig": {
+      "mode":"pac_script",
+      "pac_mandatory":false,
+      "pac_url":"http://proxycfg.my.domain.com/proxy.dat"
+    }
+  },
+]