Revert "Update all Angular libs (run update_all.sh)."

third_party/pkg/angular/lib/tools/source_crawler_impl.dart

 library angular.source_crawler_impl;
 
 import 'dart:io';
 import 'package:analyzer/analyzer.dart';
 import 'package:angular/tools/source_crawler.dart';
 
 const String PACKAGE_PREFIX = 'package:';
 
 /**
  * Dart source file crawler. As it crawls Dart source, it calls
@@ skipping 27 matching lines @@
       CompilationUnit cu = parseDartFile(currentFile);
       processImports(cu, currentDir, currentFile, visited, toVisit);
       visitor(cu);
     }
   }
 
   void processImports(CompilationUnit cu, String currentDir,
                       String currentFile, List<String> visited,
                       List<String> toVisit) {
     cu.directives.forEach((Directive directive) {
-      if (directive is ImportDirective ||
-          directive is PartDirective ||
-          directive is ExportDirective) {
+      if (directive is ImportDirective || directive is PartDirective) {
         UriBasedDirective import = directive;
         String canonicalFile = canonicalizeImportPath(
             currentDir, currentFile, import.uri.stringValue);
         if (canonicalFile == null) return;
         if (!visited.contains(canonicalFile) &&
             !toVisit.contains(canonicalFile)) {
           toVisit.add(canonicalFile);
         }
       }
     });
@@ skipping 30 matching lines @@
   }
 
   String _packageUriResolver(String uri, String packageRoot) {
     var packagePath = uri.substring(PACKAGE_PREFIX.length);
     if (!packageRoot.endsWith('/')) {
       packageRoot = packageRoot + '/';
     }
     return packageRoot + packagePath;
   }
 }