platform2: change LoggingSeverity logging::{LOG=>LOGGING}_*

They would be renamed after libchrome r822064 uprev.

BUG=chromium:1144735
TEST=./build_package --board=eve locally; CQ

Exempt-From-Owner-Approval: Mechanical change involving a lot of owners.

Change-Id: If338e215b5a2ff44441b2f42db2e384e5549abf1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2557300
Tested-by: Grace Cham <hscham@chromium.org>
Reviewed-by: Clark Chung <ckclark@chromium.org>
Reviewed-by: Sergei Datsenko <dats@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Felipe Andrade <fsandrade@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-by: Kyle Williams <kdgwill@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Andrew Lassalle <andrewlassalle@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Ian Barkley-Yeung <iby@chromium.org>
Reviewed-by: Andrey Pronin <apronin@chromium.org>
Reviewed-by: Eric Caruso <ejcaruso@chromium.org>
Reviewed-by: Garrick Evans <garrick@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Xinglong Luan <alanlxl@chromium.org>
Commit-Queue: Qijiang Fan <fqj@google.com>
diff --git a/system-proxy/connect_headers_parser_fuzzer.cc b/system-proxy/connect_headers_parser_fuzzer.cc
index e8bf56e..a68a062 100644
--- a/system-proxy/connect_headers_parser_fuzzer.cc
+++ b/system-proxy/connect_headers_parser_fuzzer.cc
@@ -48,7 +48,7 @@
 
 struct Environment {
   Environment() {
-    logging::SetMinLogLevel(logging::LOG_FATAL);  // Disable logging.
+    logging::SetMinLogLevel(logging::LOGGING_FATAL);  // Disable logging.
   }
 };
 
diff --git a/system-proxy/worker_config_fuzzer.cc b/system-proxy/worker_config_fuzzer.cc
index ceb3a80..7962b63 100644
--- a/system-proxy/worker_config_fuzzer.cc
+++ b/system-proxy/worker_config_fuzzer.cc
@@ -27,7 +27,7 @@
 
 struct Environment {
   Environment() {
-    logging::SetMinLogLevel(logging::LOG_FATAL);  // Disable logging.
+    logging::SetMinLogLevel(logging::LOGGING_FATAL);  // Disable logging.
   }
 };