Fix ambigous typos.

runtime/observatory/lib/src/elements/debugger.dart

 // Copyright (c) 2014, 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 debugger_page_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:math';
 import 'observatory_element.dart';
@@ skipping 1706 matching lines @@
 
   Future<String> complete(String line) {
     return cmd.completeCommand(line).then((completions) {
       if (completions.length == 0) {
         // No completions.  Leave the line alone.
         return line;
       } else if (completions.length == 1) {
         // Unambiguous completion.
         return completions[0];
       } else {
-        // Ambigous completion.
+        // Ambiguous completion.
         completions = completions.map((s) => s.trimRight()).toList();
         console.printBold(completions.toString());
         return _foldCompletions(completions);
       }
     });
   }
 
   // TODO(turnidge): Implement real command line history.
   String lastCommand;
 
@@ skipping 830 matching lines @@
         }
       });
   }
 
   void focus() {
     $['textBox'].focus();
   }
 
   DebuggerInputElement.created() : super.created();
 }