Revert "Update includes for webrtc/{base => rtc_base} rename (2/3)"

This reverts commit c3771cc4d37f5573fe53b7c7cff295a4f0f9560f.
(breaks downstream internal project)

BUG=webrtc:7634
NOTRY=True
NOPRESUBMIT=True

Review-Url: https://codereview.webrtc.org/2972463002 .
Cr-Commit-Position: refs/heads/master@{#18873}
diff --git a/webrtc/rtc_tools/event_log_visualizer/main.cc b/webrtc/rtc_tools/event_log_visualizer/main.cc
index 6e78c89..6ceeeec 100644
--- a/webrtc/rtc_tools/event_log_visualizer/main.cc
+++ b/webrtc/rtc_tools/event_log_visualizer/main.cc
@@ -10,8 +10,8 @@
 
 #include <iostream>
 
+#include "webrtc/base/flags.h"
 #include "webrtc/logging/rtc_event_log/rtc_event_log_parser.h"
-#include "webrtc/rtc_base/flags.h"
 #include "webrtc/rtc_tools/event_log_visualizer/analyzer.h"
 #include "webrtc/rtc_tools/event_log_visualizer/plot_base.h"
 #include "webrtc/rtc_tools/event_log_visualizer/plot_python.h"