Process null capabilities as a capability fetch failure.

chrome/test/data/webui/print_preview_destination_search_test.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var ROOT_PATH = '../../../../';
 
 GEN_INCLUDE(
         [ROOT_PATH + 'chrome/test/data/webui/polymer_browser_test_base.js']);
 
 /**
@@ skipping 178 matching lines @@
       }
 
       var destId = "001122DEADBEEF";
 
       var resolver = mockSetupCall(destId, nativeLayer_);
       requestSetup(destId, destinationSearch_);
       resolver.reject(destId);
     });
 
     test('ReceiveSuccessfulSetup', function() {
-
       var destId = "00112233DEADBEEF";
 
       var waiter = waitForEvent(
           destinationStore_,
           print_preview.DestinationStore.EventType.DESTINATION_SELECT);
 
       var resolver = mockSetupCall(destId, nativeLayer_);
 
       requestSetup(destId, destinationSearch_);
       resolveSetup(resolver, destId, true, getCaps());
 
       // wait for event propogation to complete.
       return waiter.then(function() {
         // after setup succeeds, the destination should be selected.
         assertNotEquals(null, destinationStore_.selectedDestination);
         assertEquals(destId, destinationStore_.selectedDestination.id);
       });
     });
 
-    test('ReceiveFailedSetup', function() {
-      var destId = '00112233DEADBEEF';
+    if (cr.isChromeOS) {
+      // The 'ResolutionFails' test covers this case for non-CrOS.
+      test('ReceiveFailedSetup', function() {
+        var destId = '00112233DEADBEEF';
 
-      var resolver = mockSetupCall(destId, nativeLayer_);
-      requestSetup(destId, destinationSearch_);
+        var resolver = mockSetupCall(destId, nativeLayer_);
+        requestSetup(destId, destinationSearch_);
 
-      // Force resolution to fail.
-      resolveSetup(resolver, destId, false, null);
+        // Force resolution to fail.
+        resolveSetup(resolver, destId, false, null);
 
-      if (cr.isChromeOS) {
         // Selection should not change on ChromeOS.
         assertEquals(null, destinationStore_.selectedDestination);
-      } else {
-        // Other code expects selection to be present so it still occurs
-        // for non-CrOS.
-        assertEquals(destId, destinationStore_.selectedDestination.id);
-      }
-    });
+      });
+    }
   });
 
   mocha.run();
 });