Disable Warning 4702 for the PGO builds.

base/logging.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/logging.h"
 
 #if defined(OS_WIN)
 #include <io.h>
 #include <windows.h>
 typedef HANDLE FileHandle;
@@ skipping 519 matching lines @@
                        int ctr)
     : severity_(severity), file_(file), line_(line) {
   Init(file, line);
 }
 
 LogMessage::LogMessage(const char* file, int line)
     : severity_(LOG_INFO), file_(file), line_(line) {
   Init(file, line);
 }
 
-#if defined(OS_WIN)
-// Disable warning C4702 ("unreachable code") until we fix crbug.com/380175.
-// TODO(scottmg|sebmarchand): Remove this pragma once the bug is fixed.
-#pragma warning(push)
-#pragma warning(disable: 4702)
-#endif
 LogMessage::LogMessage(const char* file, int line, LogSeverity severity)
     : severity_(severity), file_(file), line_(line) {
   Init(file, line);
 }
-#if defined(OS_WIN)
-#pragma warning(pop)
-#endif
 
 LogMessage::LogMessage(const char* file, int line, std::string* result)
     : severity_(LOG_FATAL), file_(file), line_(line) {
   Init(file, line);
   stream_ << "Check failed: " << *result;
   delete result;
 }
 
 LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
                        std::string* result)
@@ skipping 276 matching lines @@
     return *log_file_name;
   return std::wstring();
 }
 #endif
 
 }  // namespace logging
 
 std::ostream& operator<<(std::ostream& out, const wchar_t* wstr) {
   return out << base::WideToUTF8(std::wstring(wstr));
 }