Short-circuit failures in BLE js tests

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

Index: chrome/test/data/extensions/api_test/bluetooth_low_energy/get_characteristic/runtest.js
diff --git a/chrome/test/data/extensions/api_test/bluetooth_low_energy/get_characteristic/runtest.js b/chrome/test/data/extensions/api_test/bluetooth_low_energy/get_characteristic/runtest.js
index be2cd4584ece08733d12485237eff676f537d87f..d21376fb5213c1ce5e5a6c208e7008324462d4da 100644
--- a/chrome/test/data/extensions/api_test/bluetooth_low_energy/get_characteristic/runtest.js
+++ b/chrome/test/data/extensions/api_test/bluetooth_low_energy/get_characteristic/runtest.js
@@ -41,32 +41,33 @@ var characteristic = null;
 // 1. Unknown characteristic instanceId.
 chrome.bluetoothLowEnergy.getCharacteristic(badCharId, function (result) {
   if (result || !chrome.runtime.lastError) {
-    chrome.test.fail('getCharacteristics should have failed');
+    chrome.test.sendMessage('getCharacteristics should have failed');
   }
 
   // 2. Known characteristic instanceId, but the mapped device is unknown.
   chrome.bluetoothLowEnergy.getCharacteristic(charId, function (result) {
     if (result || !chrome.runtime.lastError) {
-      chrome.test.fail('getCharacteristics should have failed');
+      chrome.test.sendMessage('getCharacteristics should have failed');
     }
 
     // 3. Known characteristic instanceId, but the mapped service is unknown.
     chrome.bluetoothLowEnergy.getCharacteristic(charId, function (result) {
       if (result || !chrome.runtime.lastError) {
-        chrome.test.fail('getCharacteristics should have failed');
+        chrome.test.sendMessage('getCharacteristics should have failed');
       }
 
       // 4. Known characteristic instanceId, but the mapped service does not
       // know about the characteristic.
       chrome.bluetoothLowEnergy.getCharacteristic(charId, function (result) {
         if (result || !chrome.runtime.lastError) {
-          chrome.test.fail('getCharacteristics should have failed');
+          chrome.test.sendMessage('getCharacteristics should have failed');
         }
 
         // 5. Success.
         chrome.bluetoothLowEnergy.getCharacteristic(charId, function (result) {
           if (chrome.runtime.lastError) {
-            chrome.test.fail(chrome.runtime.lastError.message);
+            chrome.test.sendMessage("Unexpected error: "
+                + chrome.runtime.lastError.message);
           }
 
           characteristic = result;