Update pubspecs and dependencies to get pkgbuild tests working.

third_party/pkg/angular/lib/filter/lowercase.dart

Index: third_party/pkg/angular/lib/filter/lowercase.dart
diff --git a/third_party/pkg/angular/lib/filter/lowercase.dart b/third_party/pkg/angular/lib/filter/lowercase.dart
deleted file mode 100644
index 650229c95a06eb8dadaca58056593f3d19d839ed..0000000000000000000000000000000000000000
--- a/third_party/pkg/angular/lib/filter/lowercase.dart
+++ /dev/null
@@ -1,13 +0,0 @@
-part of angular.filter;
-
-/**
- * Converts string to lowercase.
- *
- * Usage:
- *
- *     {{ lowercase_expression | lowercase }}
- */
-@NgFilter(name:'lowercase')
-class LowercaseFilter {
-  call(String text) => text == null ? text : text.toLowerCase();
-}