Fixed package: imports breaking apidoc.

utils/apidoc/apidoc.dart

Index: utils/apidoc/apidoc.dart
diff --git a/utils/apidoc/apidoc.dart b/utils/apidoc/apidoc.dart
index 742e5197fa06f3fa28feaa605dc7a9933d5edb7e..a73a1de8aef2eccb5261b0468451482c88eb5646 100644
--- a/utils/apidoc/apidoc.dart
+++ b/utils/apidoc/apidoc.dart
@@ -34,6 +34,7 @@ void main() {
 
   List<String> excludedLibraries = <String>[];
   List<String> includedLibraries = <String>[];
+  var pkgPath;
 
 
   // Parse the command-line arguments.
@@ -60,6 +61,8 @@ void main() {
           includedLibraries.add(arg.substring('--include-lib='.length));
         } else if (arg.startsWith('--out=')) {
           outputDir = new Path.fromNative(arg.substring('--out='.length));
+        } else if (arg.startsWith('--pkg=')) {
+          pkgPath = arg.substring('--pkg='.length);
         } else {
           print('Unknown option: $arg');
           return;
@@ -69,7 +72,6 @@ void main() {
   }
 
   final libPath = doc.scriptDir.append('../../sdk/');
-  final pkgPath = doc.scriptDir.append('../../pkg/');
 
   doc.cleanOutputDirectory(outputDir);