Remove package root target and support scripts

dart.gyp

Index: dart.gyp
diff --git a/dart.gyp b/dart.gyp
index f3e6e8206ad0bc6b307df53447a4c3908e3bb0ea..c24fbc7ca6f8b41146cd45cf87bf4664f87b4c5b 100644
--- a/dart.gyp
+++ b/dart.gyp
@@ -13,7 +13,6 @@
         'dart2js',
         'dartanalyzer',
         'dartdevc',
-        'packages',
         'runtime',
         'samples',
       ],
@@ -29,7 +28,6 @@
         'runtime/dart-runtime.gyp:dart_bootstrap#host',
         'runtime/dart-runtime.gyp:run_vm_tests',
         'runtime/dart-runtime.gyp:process_test',
-        'packages',
         'runtime/dart-runtime.gyp:test_extension',
         'runtime/dart-runtime.gyp:sample_extension',
       ],
@@ -43,7 +41,6 @@
       'dependencies': [
         'runtime/dart-runtime.gyp:dart_precompiled_runtime',
         'runtime/dart-runtime.gyp:dart_bootstrap#host',
-        'packages',
       ],
     },
     {
@@ -58,7 +55,6 @@
         'runtime/dart-runtime.gyp:dart_bootstrap#host',
         'runtime/dart-runtime.gyp:run_vm_tests',
         'runtime/dart-runtime.gyp:process_test',
-        'packages',
         'runtime/dart-runtime.gyp:test_extension',
         'runtime/dart-runtime.gyp:sample_extension',
       ],
@@ -113,7 +109,6 @@
       'type': 'none',
       'dependencies': [
         'create_sdk',
-        'packages',
       ],
     },
     {
@@ -129,12 +124,5 @@
         ],
       ]
     },
-    {
-      'target_name': 'packages',
-      'type': 'none',
-      'dependencies': [
-        'pkg/pkg.gyp:pkg_packages',
-      ],
-    },
   ],
 }