Process null capabilities as a capability fetch failure.

chrome/test/data/webui/print_preview_destination_search_test.js

Index: chrome/test/data/webui/print_preview_destination_search_test.js
diff --git a/chrome/test/data/webui/print_preview_destination_search_test.js b/chrome/test/data/webui/print_preview_destination_search_test.js
index 2155bd7820beb4ff844b9bbad2fb318f5ba96494..c284da68f2d91525c0525544a70a3daffb019d56 100644
--- a/chrome/test/data/webui/print_preview_destination_search_test.js
+++ b/chrome/test/data/webui/print_preview_destination_search_test.js
@@ -196,7 +196,6 @@ TEST_F('PrintPreviewDestinationSearchTest', 'Select', function() {
     });
 
     test('ReceiveSuccessfulSetup', function() {
-
       var destId = "00112233DEADBEEF";
 
       var waiter = waitForEvent(
@@ -217,6 +216,11 @@ TEST_F('PrintPreviewDestinationSearchTest', 'Select', function() {
     });
 
     test('ReceiveFailedSetup', function() {

[dpapad, 2017/05/02 00:07:41]

if (cr.isChromeOS) {
  test('ReceiveFailedSetup', function() {
     ...
  });
}

[skau, 2017/05/02 01:52:48]

Done.

+      if (!cr.isChromeOS) {
+        // The 'ResolutionFails' test covers this case for non-CrOS.

[dpapad, 2017/05/02 00:07:41]

ResolutionFails test also returns early for non-CrOS. Is this comment accurate?

[skau, 2017/05/02 01:52:48]

The comment is accurate.  The other test is disabled due to a bug because it
logs an error and causes the test to fail.

+        return;
+      }
+
       var destId = '00112233DEADBEEF';
 
       var resolver = mockSetupCall(destId, nativeLayer_);
@@ -225,14 +229,8 @@ TEST_F('PrintPreviewDestinationSearchTest', 'Select', function() {
       // 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);
-      }
+      // Selection should not change on ChromeOS.
+      assertEquals(null, destinationStore_.selectedDestination);
     });
   });