Rename NavigationHolder to NavigationCollector.

pkg/analysis_server/lib/src/domain_analysis.dart

Index: pkg/analysis_server/lib/src/domain_analysis.dart
diff --git a/pkg/analysis_server/lib/src/domain_analysis.dart b/pkg/analysis_server/lib/src/domain_analysis.dart
index 6b2c3775fe6da06d2422b4e5c0796b88d99d56aa..8c6be5146b61c4ddec2c54e150fc93ad25a8a14d 100644
--- a/pkg/analysis_server/lib/src/domain_analysis.dart
+++ b/pkg/analysis_server/lib/src/domain_analysis.dart
@@ -136,14 +136,14 @@ class AnalysisDomainHandler implements RequestHandler {
             server.sendResponse(new Response.getNavigationInvalidFile(request));
           } else {
             CompilationUnitElement unitElement = units.first.element;
-            NavigationHolderImpl holder = computeNavigation(
+            NavigationCollectorImpl collector = computeNavigation(
                 server,
                 unitElement.context,
                 unitElement.source,
                 params.offset,
                 params.length);
             server.sendResponse(new AnalysisGetNavigationResult(
-                    holder.files, holder.targets, holder.regions)
+                    collector.files, collector.targets, collector.regions)
                 .toResponse(request.id));
           }
           break;