Update remaining usages of Completer.completeException.

pkg/webdriver/lib/webdriver.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library webdriver;
 
 import 'dart:json' as json;
 import 'dart:uri';
 import 'dart:io';
 
@@ skipping 245 matching lines @@
         r.headers.add(
             HttpHeaders.CONTENT_TYPE, 'application/json;charset=UTF-8');
         OutputStream s = r.outputStream;
         if (params != null && params is Map) {
           s.writeString(json.stringify(params));
         }
         s.close();
       };
       connection.onError = (e) {
         if (completer != null) {
-          completer.completeException(new WebDriverError(-1, e));
+          completer.completeError(new WebDriverError(-1, e));
           completer = null;
         }
       };
       connection.followRedirects = false;
       connection.onResponse = (r) {
         StringInputStream s = new StringInputStream(r.inputStream);
         StringBuffer sbuf = new StringBuffer();
         s.onData = () {
           var data = s.read();
           if (data != null) {
@@ skipping 36 matching lines @@
           if (status == 0) {
             if (customHandler != null) {
               customHandler(r, value);
             } else if (completer != null) {
               completer.complete(value);
             }
           }
         };
       };
     } catch (e, s) {
-      completer.completeException(
+      completer.completeError(
           new WebDriverError(-1, e), s);
       completer = null;
     }
   }
 
   Future _simpleCommand(method, extraPath, [successCodes, params]) {
     var completer = new Completer();
     _serverRequest(method, '${_path}/$extraPath', completer,
           successCodes, params: params);
     return completer.future;
@@ skipping 1022 matching lines @@
    * Get the log for a given log type. Log buffer is reset after each request.
    * Each log entry is a [Map] with these fields:
    *
    * 'timestamp' (int) - The timestamp of the entry.
    * 'level' (String) - The log level of the entry, for example, "INFO".
    * 'message' (String) - The log message.
    */
   Future<List<Map>> getLogs(String type) =>
       _post('log', params: { 'type': type });
 }