Parse "removable" and "productId" fields from apps.list response.

BUG=334966
R=hashimoto@chromium.org

Review URL: https://codereview.chromium.org/132333006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248831 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248831