components: Fix 'gn check' errors for the targets under bookmarks/.

Tested on Linux with the following command lines:

$ gn gen out-gn/Debug
$ gn check out-gn/Debug //components/bookmarks/*

BUG=367595, 376000
TEST=see above
R=brettw@chromium.org,sky@chromium.org

Review URL: https://codereview.chromium.org/1180953002

Cr-Commit-Position: refs/heads/master@{#334156}

1 files changed, 2 insertions, 0 deletions

diff --git a/.gn b/.gn
index 4f9cf60..55b4c13 100644
--- a/.gn
+++ b/.gn
@@ -33,6 +33,8 @@ check_targets = [
   "//cloud_print/*",
 
   #"//components/*",  # Lots of errors.
+  "//components/bookmarks/*",
+
   #"//content/*",  # A whole lot of errors.
   "//courgette/*",
   "//crypto/*",