[dart-pkg] Allow images in packages

Change-Id: I9bdec7efa560d1fc94731d24df4013ad1ad16a92
diff --git a/dart/package_importer.py b/dart/package_importer.py
index 1eee643..22daf3d 100755
--- a/dart/package_importer.py
+++ b/dart/package_importer.py
@@ -18,8 +18,8 @@
 LICENSE_FILES = ['LICENSE', 'LICENSE.txt']
 
 
-IGNORED_EXTENSIONS = ['css', 'html', 'jpg', 'js', 'log', 'old', 'out',
-                      'packages', 'png', 'snapshot', 'zip']
+IGNORED_EXTENSIONS = ['css', 'html', 'js', 'log', 'old', 'out',
+                      'packages', 'snapshot', 'zip']
 
 LOCAL_PACKAGES = {
   'analyzer': '//third_party/dart/pkg/analyzer',