Fix CrOS reverting to Save as PDF and random PDF preview fail

chrome/browser/resources/print_preview/data/print_ticket_store.js

Index: chrome/browser/resources/print_preview/data/print_ticket_store.js
diff --git a/chrome/browser/resources/print_preview/data/print_ticket_store.js b/chrome/browser/resources/print_preview/data/print_ticket_store.js
index c3abdf2812f4f8315914de61bca3041b30148650..29c05f21c2fa025a40670f56124cfe689da2073d 100644
--- a/chrome/browser/resources/print_preview/data/print_ticket_store.js
+++ b/chrome/browser/resources/print_preview/data/print_ticket_store.js
@@ -558,6 +558,8 @@ cr.define('print_preview', function() {
      * @private
      */
     onSelectedDestinationCapabilitiesReady_: function() {
+      if (!this.destinationStore_.selectedDestination)

[dpapad, 2016/11/18 00:29:16]

Can you add a comment explaining how this function can executed before
selectedDestination is populated?

[rbpotter, 2016/11/18 02:59:23]

I was getting an error here previously but after fixing the other issues I have
not been able to duplicate it. It also should not be possible so I have removed
this check.

+        return;
       var caps = assert(
           this.destinationStore_.selectedDestination.capabilities);
       var isFirstUpdate = this.capabilitiesHolder_.get() == null;