Revert "Fixes for the test framework multitests."

tools/testing/dart/multitest.dart

Index: tools/testing/dart/multitest.dart
diff --git a/tools/testing/dart/multitest.dart b/tools/testing/dart/multitest.dart
index 4116780d9c4293289da45885bc5afe33b5763aea..3c9c535dfd73e39f72b115ae8240f4d83c9c600b 100644
--- a/tools/testing/dart/multitest.dart
+++ b/tools/testing/dart/multitest.dart
@@ -179,12 +179,7 @@ Set<String> _findAllRelativeImports(Path topLibrary) {
   Set<String> foundImports = new Set<String>();
   Path libraryDir = topLibrary.directoryPath;
   RegExp relativeImportRegExp = new RegExp(
-      '^(?:@.*\\s+)?' // Allow for a meta-data annotation.
-      '(import|part)'
-      '\\s+["\']'
-      '(?!(dart:|dart-ext:|package:|/))' // Look-ahead: not in package.
-      '([^"\']*)' // The path to the imported file.
-      '["\']');
+      '^(import|part)\\s+["\'](?!(dart:|dart-ext:|package:|/))([^"\']*)["\']');
   while (!toSearch.isEmpty) {
     var thisPass = toSearch;
     toSearch = new Set<Path>();