Removed all analyzer issues from tests

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

 // Copyright (c) 2015, 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.
 
 part of debugger;
 
 class DebuggerLocation {
   DebuggerLocation.file(this.script, this.line, this.col);
   DebuggerLocation.func(this.function);
   DebuggerLocation.error(this.errorMessage);
@@ skipping 238 matching lines @@
       if (functions.length == 0) {
         return new DebuggerLocation.error(
             "Function '${match.group(0)}' not found");
       } else if (functions.length == 1) {
         return new DebuggerLocation.func(functions[0]);
       } else {
         // TODO(turnidge): Allow the user to disambiguate.
         return new DebuggerLocation.error(
             "Function '${match.group(0)}' is ambiguous");
       }
-      return new DebuggerLocation.error('foo');
     });
   }
 
   static RegExp partialSourceLocMatcher =
       new RegExp(r'^([^\d:]?[^:]+[:]?)?(\d+)?([:]\d*)?');
   static RegExp partialFunctionMatcher = new RegExp(r'^([^.]*)([.][^.]*)?');
 
   /// Completes a partial source location description.
   static Future<List<String>> complete(Debugger debugger, String locDesc) {
     List<Future<List<String>>> pending = [];
@@ skipping 174 matching lines @@
     return 'invalid source location (${errorMessage})';
   }
 
   Script script;
   int line;
   int col;
   ServiceFunction function;
   String errorMessage;
   bool get valid => (errorMessage == null);
 }