Remove buildbot hack. Fixes dartbug.com/6847.

utils/pub/git_source.dart

Index: utils/pub/git_source.dart
diff --git a/utils/pub/git_source.dart b/utils/pub/git_source.dart
index 2cba5ca1a36b389cd636748355d0add579641ddf..6327638d93ba54925cc3da600db4e351cab060dc 100644
--- a/utils/pub/git_source.dart
+++ b/utils/pub/git_source.dart
@@ -148,15 +148,6 @@ class GitSource extends Source {
    * remote repository. See the manpage for `git clone` for more information.
    */
   Future _clone(String from, String to, {bool mirror: false}) {
-    // TODO(rnystrom): For some mysterious reason, the Windows buildbots do not
-    // have the right working directory when pub spawns git, so the relative
-    // path fails. To work around it, if [from] looks like a relative path then
-    // manually make it absolute here. Should figure out what's really going on.
-    var URL_LIKE = new RegExp(r'^[a-z]+\:');
-    if (!URL_LIKE.hasMatch(from)) {
-      from = getFullPath(from);
-    }
-
     // Git on Windows does not seem to automatically create the destination
     // directory.
     return ensureDir(to).chain((_) {