Delete all log messages depending on system_wrappers.

webrtc/logging/rtc_event_log/rtc_event_log_helper_thread.cc

Index: webrtc/logging/rtc_event_log/rtc_event_log_helper_thread.cc
diff --git a/webrtc/logging/rtc_event_log/rtc_event_log_helper_thread.cc b/webrtc/logging/rtc_event_log/rtc_event_log_helper_thread.cc
index f8fda492236d78f1847f5c6d4dfc214732daf65c..ad0167b76041fe2b2b2489ed446d333977ba2d7f 100644
--- a/webrtc/logging/rtc_event_log/rtc_event_log_helper_thread.cc
+++ b/webrtc/logging/rtc_event_log/rtc_event_log_helper_thread.cc
@@ -14,7 +14,6 @@
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/timeutils.h"
-#include "webrtc/system_wrappers/include/logging.h"
 
 #ifdef ENABLE_RTC_EVENT_LOG
 
@@ -67,7 +66,6 @@ RtcEventLogHelperThread::~RtcEventLogHelperThread() {
     // any STOP_FILE events, then the threads calling StopLogging would likely
     // wait indefinitely. However, there should not be any such calls as we
     // are executing the destructor.
-    LOG(LS_WARNING) << "Clearing message queue to terminate thread.";
     message_queue_->Clear();
   }
   wake_from_hibernation_.Set();
@@ -153,7 +151,6 @@ void RtcEventLogHelperThread::StartLogFile() {
 
   // Write to file.
   if (!file_->Write(output_string_.data(), output_string_.size())) {
-    LOG(LS_ERROR) << "FileWrapper failed to write WebRtcEventLog file.";
     // The current FileWrapper implementation closes the file on error.
     RTC_DCHECK(!file_->is_open());
     return;
@@ -198,7 +195,6 @@ bool RtcEventLogHelperThread::LogToFile() {
 
   // Write string to file.
   if (!file_->Write(output_string_.data(), output_string_.size())) {
-    LOG(LS_ERROR) << "FileWrapper failed to write WebRtcEventLog file.";
     // The current FileWrapper implementation closes the file on error.
     RTC_DCHECK(!file_->is_open());
     return message_received;
@@ -233,7 +229,6 @@ void RtcEventLogHelperThread::StopLogFile() {
   if (written_bytes_ + static_cast<int64_t>(output_string_.size()) <=
       max_size_bytes_) {
     if (!file_->Write(output_string_.data(), output_string_.size())) {
-      LOG(LS_ERROR) << "FileWrapper failed to write WebRtcEventLog file.";
       // The current FileWrapper implementation closes the file on error.
       RTC_DCHECK(!file_->is_open());
     }