Remove fetching of RBE cfg files.

Remove fetching of RBE cfg files with CIPD. Instead rely on local cfg
files which use public docker images rather than private ones. Taken
from Chromium's trunk.

b/384982606

build/toolchain/rbe.gni

@@ -18,17 +18,15 @@ declare_args() {
 
   # The directory where the re-client configuration files are.
   rbe_cfg_dir = rebase_path("//buildtools/reclient_cfgs", root_build_dir)
+  cobalt_rbe_cfg_dir = rebase_path("//cobalt/reclient_cfgs", root_build_dir)
 }
 
 declare_args() {
   # Set to the path of the RBE reclient configuration files.
   # Configuration file selection based on operating system.
   if (is_linux || is_android || is_chromeos || is_fuchsia) {
-    rbe_py_cfg_file = "${rbe_cfg_dir}/python/rewrapper_linux.cfg"
-    rbe_cc_cfg_file =
-        "${rbe_cfg_dir}/chromium-browser-clang/rewrapper_linux.cfg"
-    rbe_link_cfg_file =
-        "${rbe_cfg_dir}/chromium-browser-clang/rewrapper_linux_link.cfg"
+    rbe_py_cfg_file = "${cobalt_rbe_cfg_dir}/rewrapper_linux_py.cfg"
+    rbe_cc_cfg_file = "${cobalt_rbe_cfg_dir}/rewrapper_linux_cc.cfg"
   } else if (is_win) {
     rbe_py_cfg_file = "${rbe_cfg_dir}/python/rewrapper_windows.cfg"
     rbe_cc_cfg_file =

buildtools/reclient_cfgs/fetch_reclient_cfgs.py

@@ -135,8 +135,9 @@ def main():
             logging.error(
               '--rbe_instance is required if --reproxy_cfg_template is set')
             return 1
-        if not GenerateReproxyCfg(args.reproxy_cfg_template, args.rbe_instance):
-           return 1
+        if GenerateReproxyCfg(args.reproxy_cfg_template, args.rbe_instance):
+           return 0
+    return 1
 
     if not args.rewrapper_cfg_project and not args.rbe_instance:
         logging.error(

cobalt/reclient_cfgs/rewrapper_linux_cc.cfg

@@ -0,0 +1,8 @@
+platform=container-image=docker://gcr.io/chops-public-images-prod/rbe/siso-chromium/linux@sha256:26de99218a1a8b527d4840490bcbf1690ee0b55c84316300b60776e6b3a03fe1,label:action_default=1
+server_address=unix:///tmp/reproxy.sock
+labels=type=compile,compiler=clang,lang=cpp
+exec_strategy=remote_local_fallback
+dial_timeout=10m
+exec_timeout=2m
+reclient_timeout=2m
+canonicalize_working_dir=true

cobalt/reclient_cfgs/rewrapper_linux_py.cfg

@@ -0,0 +1,8 @@
+platform=container-image=docker://gcr.io/chops-public-images-prod/rbe/siso-chromium/linux@sha256:26de99218a1a8b527d4840490bcbf1690ee0b55c84316300b60776e6b3a03fe1,label:action_default=1
+server_address=unix:///tmp/reproxy.sock
+labels=type=tool
+exec_strategy=remote_local_fallback
+dial_timeout=10m
+canonicalize_working_dir=true
+exec_timeout=2m
+reclient_timeout=2m