Remove old debug output.

pkg/analysis_server/lib/src/protocol_server.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 protocol.server;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart'
     as engine;
 import 'package:analyzer/src/generated/ast.dart' as engine;
@@ skipping 195 matching lines @@
   engine.CompilationUnitElement unitElement = unit.element;
   engine.AnalysisContext context = unitElement.context;
   engine.Source source = unitElement.source;
   return _locationForArgs(context, source, range);
 }
 
 NavigationTarget newNavigationTarget_fromElement(
     engine.Element element, int fileToIndex(String file)) {
   ElementKind kind = newElementKind_fromEngine(element.kind);
   Location location = newLocation_fromElement(element);
-  // TODO(scheglov) debug null Location
-  if (location == null) {
-    String desc = 'location == null';
-    try {
-      desc += ' for: $element';
-      desc += ' of type: ${element.runtimeType}';
-      desc += ' element.location: ${element.location}';
-      desc += ' element.context: ${element.context}';
-      desc += ' element.source: ${element.source}';
-    } catch (e) {}
-    throw new ArgumentError(desc);
-  }
   String file = location.file;
   int fileIndex = fileToIndex(file);
   return new NavigationTarget(kind, fileIndex, location.offset, location.length,
       location.startLine, location.startColumn);
 }
 
 /**
  * Construct based on an element from the analyzer engine.
  */
 OverriddenMember newOverriddenMember_fromEngine(engine.Element member) {
@@ skipping 184 matching lines @@
     if (lineInfo != null) {
       engine.LineInfo_Location offsetLocation =
           lineInfo.getLocation(range.offset);
       startLine = offsetLocation.lineNumber;
       startColumn = offsetLocation.columnNumber;
     }
   }
   return new Location(
       source.fullName, range.offset, range.length, startLine, startColumn);
 }