Stop running pub get at gclient sync time and fix build bugs

mojo/public/tools/dart_pkg.py

Index: mojo/public/tools/dart_pkg.py
diff --git a/mojo/public/tools/dart_pkg.py b/mojo/public/tools/dart_pkg.py
index b3e14045d20f530e78b28288057e66086809eab4..611ef85ba30821b5ed0ab31f4de2d861251ad275 100755
--- a/mojo/public/tools/dart_pkg.py
+++ b/mojo/public/tools/dart_pkg.py
@@ -302,15 +302,6 @@ def main():
   package_path = os.path.join(args.package_root, args.package_name)
   link(lib_path, package_path)
 
-  # Symlink non-dart-pkg dependent packages
-  dep_packages = os.path.join(common_source_prefix, 'packages')
-  if os.path.exists(dep_packages):
-    for package in os.listdir(dep_packages):
-      source = os.path.join(dep_packages, package)
-      target = os.path.join(args.package_root, package)
-      if not os.path.exists(target):
-        link(source, target)
-
   # TODO(zra): Remove when bindings are generated by the mojom package and
   # checked in.
   # Copy generated bindings back to the source directory.