Revert "Return an absolute URI for Platform.script."

sdk/lib/io/platform.dart

Index: sdk/lib/io/platform.dart
diff --git a/sdk/lib/io/platform.dart b/sdk/lib/io/platform.dart
index ccbbb3fb89e8b57216b39d12d67edcf637f489d3..16d0a1e65cacfb3f7bdcca04b1a04ca6ff7b078f 100644
--- a/sdk/lib/io/platform.dart
+++ b/sdk/lib/io/platform.dart
@@ -80,14 +80,9 @@ class Platform {
   static String get executable => _Platform.executable;
 
   /**
-   * Returns the absolute URI of the script being run in this
-   * isolate. If the script argument on the command line is relative,
-   * it is resolved to an absolute URI before fetching the script, and
-   * this absolute URI is returned.
-   *
-   * This implies that a path including "link/.." in the script name
-   * is resolved by dropping the link component, which may be different
-   * from the file system's path resolution behavior.
+   * Returns the URI of the script being run in this
+   * isolate. If the URI is relative it is relative to the file URI of
+   * the working directory of the VM when it was started.
    *
    * If the executable environment does not support [script] an empty
    * URI is returned.