Teach rewrite_scoped_ptr_ctor_null about scoped_ptr_malloc's default arg

Without filtering out default args, the tool matches the implicit
initializers generated for scoped_ptr_malloc<T> members... and then
deletes random tokens. Needless to say, the result doesn't compile.

BUG=173286
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/16658016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205700 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed