Added a diagnostic user message when enumerating printers fails. Also tweaked...

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
===================================================================
--- chrome/app/generated_resources.grd	(revision 72357)
+++ chrome/app/generated_resources.grd	(working copy)
@@ -5371,8 +5371,11 @@
         An error occurred while retrieving printer capabilities for printer <ph name="PRINTER_NAME">$1<ex>HP Laserjet 7900</ex></ph>. This printer could not be registered with <ph name="CLOUD_PRINT_NAME">Google Cloud Print</ph>.
       </message>
       <message name="IDS_CLOUD_PRINT_XPS_UNAVAILABLE" desc="Status message to be sent to the Cloud Print server when the XPS framework is missing.">
-        The Microsoft XML Paper Specification Essentials Pack is not installed on the machine running the Google Cloud Print connector.
+        The <ph name="CLOUD_PRINT_NAME">Google Cloud Print</ph> connector requires that the Microsoft XML Paper Specification Essentials Pack be installed.
       </message>
+      <message name="IDS_CLOUD_PRINT_ENUM_FAILED" desc="Status message to be sent to the Cloud Print server when enumerating printers failed.">
+        There was a problem listing printers. Some of your printers may not have registered successfully with <ph name="CLOUD_PRINT_NAME">Google Cloud Print</ph>.
+    </message>
 
       <!-- Print Preview -->
       <message name="IDS_PRINT_PREVIEW_TITLE" desc="Title for print preview page ">