Update stats-log-api-gen based off of google3 presubmit-checks

Bug: 161812407
Test: `m statslog-framework-java-gen`
Test: `m statslog-telephony-java-gen`
Test: `m stats-log-api-gen-test &&
out/host/linux-x86/nativetest/stats-log-api-gen-test/stats-log-api-gen-test`

Change-Id: Icddf5ef21155ede50319fc2bf7c8a361eeb09539
Merged-In: Icddf5ef21155ede50319fc2bf7c8a361eeb09539
Merged-In: I24a35e850e73c20950db8e4c8d4e0088425dc288
(cherry picked from commit c9d9f93570bf50674ee8f9f09b5a4d0dd85e51f4)
diff --git a/stats/stats_log_api_gen/main.cpp b/stats/stats_log_api_gen/main.cpp
index fe7403b..50f8176 100644
--- a/stats/stats_log_api_gen/main.cpp
+++ b/stats/stats_log_api_gen/main.cpp
@@ -15,8 +15,6 @@
 #include "native_writer.h"
 #include "utils.h"
 
-using namespace google::protobuf;
-
 namespace android {
 namespace stats_log_api_gen {