Revert "Enable use of #import stmts containing relative paths in Dart multitests" This change broke…

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
diff --git a/tools/testing/dart/test_suite.dart b/tools/testing/dart/test_suite.dart
index b83c2acf64b1c1c2843a7c8cc5f7730d44f9bf48..c1286c8b60a64cf1072a2377e9cab0b311c150e3 100644
--- a/tools/testing/dart/test_suite.dart
+++ b/tools/testing/dart/test_suite.dart
@@ -670,8 +670,15 @@ class StandardTestSuite implements TestSuite {
         tempDir.createSync();
       }
     }
-    TestUtils.mkdirRecursive(tempDirPath, 
-      Strings.join(generatedTestPath, '/'));
+    tempDirPath = new File(tempDirPath).fullPathSync().replaceAll('\\', '/');
+
+    for (String subdirectory in generatedTestPath) {
+      tempDirPath = '$tempDirPath/$subdirectory';
+      tempDir = new Directory(tempDirPath);
+      if (!tempDir.existsSync()) {
+        tempDir.createSync();
+      }
+    }
     return tempDir;
   }
 
@@ -1016,39 +1023,6 @@ class JUnitTestSuite implements TestSuite {
 
 
 class TestUtils {
-  
-  /** 
-   * Creates a directory using a [relativePath] to an existing 
-   * [base] directory if that [relativePath] does not already exist.
-   */
-  static void mkdirRecursive(String base, String relativePath) {
-    Directory baseDir = new Directory(base);
-    Expect.isTrue(baseDir.existsSync(),
-      "This method expects ${base} to already exist"); 
-    String pathSep = new Platform().pathSeparator();
-    if (pathSep != '/') {
-      relativePath = relativePath.replaceAll(pathSep, '/');
-    }   
-    for (String dir in relativePath.split('/')) {
-      var tempDir = new Directory('$base/$dir');
-      if (!tempDir.existsSync()) {
-          tempDir.createSync();
-      }
-      base = "$base/$dir";
-    }
-  }
-
-  /**
-   * Copy a [source] file to a new place.
-   * Assumes that the directory for [dest] already exists.
-   */
-  static void copyFile(File source, File dest) {
-    List contents = source.readAsBytesSync();
-    RandomAccessFile handle = dest.openSync(FileMode.WRITE);
-    handle.writeListSync(contents, 0, contents.length);
-    handle.closeSync();
-  }
-  
   static String executableSuffix(String component) {
     if (new Platform().operatingSystem() == 'windows') {
       if (component != 'frogium'