Bug 765200 - Shorten errors of type: "an unexpected uncaught JS exception reported through window.onerror - ..."; r=jmaher a=test-only

--HG--
extra : transplant_source : %B8%7D%B9%D6%05T%21%A7k%05%E3%25%A60%B9%29kg%FE%F5

testing/mochitest/tests/SimpleTest/SimpleTest.js

@@ -975,9 +975,8 @@ window.onerror = function simpletestOnerror(errorMsg, url, lineNumber) {
     // For now, for tests that self identify as having unintentional uncaught
     // exceptions, just dump it so that the error is visible but doesn't cause
     // a test failure.  See bug 652494.
-    var href = SpecialPowers.getPrivilegedProps(window, 'location.href');
     var isExpected = !!SimpleTest._expectingUncaughtException;
-    var message = "an " + (isExpected ? "" : "un") + "expected uncaught JS exception reported through window.onerror";
+    var message = (isExpected ? "expected " : "") + "uncaught exception";
     var error = errorMsg + " at " + url + ":" + lineNumber;
     if (!SimpleTest._ignoringAllUncaughtExceptions) {
         SimpleTest.ok(isExpected, message, error);