GitLab

 - Move preprocess_grit() for cr_components/ under
   cr_components/BUILD.gn
 - Add new generate_grd() target in cr_components/
 - Remove now obsolete alias in shared_resources_data_source.cc.

Note: cr_components/cr_components_images.grdp will be addressed in
a follow up CL.

Bug: 1132403
Change-Id: Id41f9c08e498d1a014854b1ebc6ee20d6cf7b916
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495082
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821370}