Revert "Update includes for webrtc/{base => rtc_base} rename (1/3)"

This reverts commit c8fa692ec44fd6ba4fa3d085ac3161a262fc18c5.

BUG=webrtc:7634
NOTRY=True
NOPRESUBMIT=True

Review-Url: https://codereview.webrtc.org/2964773002 .
Cr-Commit-Position: refs/heads/master@{#18872}
diff --git a/webrtc/modules/utility/source/process_thread_impl.h b/webrtc/modules/utility/source/process_thread_impl.h
index 4f4c65d..e07c3d7 100644
--- a/webrtc/modules/utility/source/process_thread_impl.h
+++ b/webrtc/modules/utility/source/process_thread_impl.h
@@ -15,11 +15,11 @@
 #include <memory>
 #include <queue>
 
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/base/location.h"
+#include "webrtc/base/platform_thread.h"
+#include "webrtc/base/thread_checker.h"
 #include "webrtc/modules/utility/include/process_thread.h"
-#include "webrtc/rtc_base/criticalsection.h"
-#include "webrtc/rtc_base/location.h"
-#include "webrtc/rtc_base/platform_thread.h"
-#include "webrtc/rtc_base/thread_checker.h"
 #include "webrtc/system_wrappers/include/event_wrapper.h"
 #include "webrtc/typedefs.h"