Short-circuit failures in BLE js tests

chrome/test/data/extensions/api_test/bluetooth_low_energy/write_descriptor_value/runtest.js

Index: chrome/test/data/extensions/api_test/bluetooth_low_energy/write_descriptor_value/runtest.js
diff --git a/chrome/test/data/extensions/api_test/bluetooth_low_energy/write_descriptor_value/runtest.js b/chrome/test/data/extensions/api_test/bluetooth_low_energy/write_descriptor_value/runtest.js
index ca687b10d375ec87d3c01bfb338a91379985ce0c..d2484cc172808fed0913d2082020bcf913e77108 100644
--- a/chrome/test/data/extensions/api_test/bluetooth_low_energy/write_descriptor_value/runtest.js
+++ b/chrome/test/data/extensions/api_test/bluetooth_low_energy/write_descriptor_value/runtest.js
@@ -30,19 +30,19 @@ valueBytes.set(bytes);
 // 1. Unknown descriptor instanceId.
 writeDescriptorValue(badDescId, writeValue, function (result) {
   if (result || !chrome.runtime.lastError) {
-    chrome.test.fail('\'badDescId\' did not cause failure');
+    chrome.test.sendMessage('\'badDescId\' did not cause failure');
   }
 
   // 2. Known descriptor instanceId, but call failure.
   writeDescriptorValue(descId, writeValue, function (result) {
     if (result || !chrome.runtime.lastError) {
-      chrome.test.fail('writeDescriptorValue should have failed');
+      chrome.test.sendMessage('writeDescriptorValue should have failed');
     }
 
     // 3. Call should succeed.
     writeDescriptorValue(descId, writeValue, function (result) {
       if (chrome.runtime.lastError) {
-        chrome.test.fail(chrome.runtime.lastError.message);
+        chrome.test.sendMessage(chrome.runtime.lastError.message);
       }
 
       chrome.bluetoothLowEnergy.getDescriptor(descId, function (result) {