config_dump: Switch to ARCHIVE_URL.

Swith to using a site property for the archive url. This allows the bot
name to be automatically appended to the URL, which allows different
bots to share an archive location without colliding.

BUG=None
TEST=Built locally.

Change-Id: I04bcde9429e65ba3cca79dea07a9d9f54a7b2402
Reviewed-on: https://chromium-review.googlesource.com/308199
Reviewed-by: Matthew Sartori <msartori@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>
diff --git a/config_dump.json b/config_dump.json
index c07d78b..4d809ad 100644
--- a/config_dump.json
+++ b/config_dump.json
@@ -1,11 +1,10 @@
 {
     "_default": {
         "boards": [],
-        "manifest_repo_url": "https://chromium.googlesource.com/chromiumos/chromite/abuildbot_config",
-        "gs_path": "gs://abuildbot-build-archive/abuildbot"
-
+        "manifest_repo_url": "https://chromium.googlesource.com/chromiumos/chromite/abuildbot_config"
     },
     "_site_params": {
+        "ARCHIVE_URL": "gs://abuildbot-build-archive/abuildbot"
     },
     "_templates": {},