Surface error messages from ONC parsing in about:policy.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index b9ed348bbef433e3512930ba1cf57525866c006b..2dedf65d6b5a00055ab6ce81dad1a13af9f2b812 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4456,6 +4456,9 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_POLICY_OVERRIDDEN" desc="The text displayed in the status column when the corresponding policy is being ignored because another policy is overriding it.">
         Ignored because it was overridden by <ph name="POLICY_NAME">$1<ex>ProxyMode</ex></ph>.
       </message>
+      <message name="IDS_POLICY_NETWORK_CONFIG_PARSE_ERROR" desc="The text displayed in the status column when the corresponding network configuration policy failed to parse.">
+        Network configuration failed to be parsed: <ph name="PARSE_ERROR_MESSAGE">$1<ex>Line: 1, column: 1, Root value must be an array or object.</ex></ph>
+      </message>
 
       <!-- about:flags -->
       <message name="IDS_FLAGS_LONG_TITLE" desc="Long version of the title for the about:flags page.">