Fix DCHECH errors on Windows

headless/lib/headless_content_main_delegate.cc

 // Copyright 2015 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 "headless/lib/headless_content_main_delegate.h"
 
 #include <utility>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
@@ skipping 80 matching lines @@
   } else {
     command_line->AppendSwitch(switches::kDisableGpu);
   }
 
   SetContentClient(&content_client_);
   return false;
 }
 
 void HeadlessContentMainDelegate::InitLogging(
     const base::CommandLine& command_line) {
+  const std::string process_type =
+      command_line.GetSwitchValueASCII(switches::kProcessType);
 #if !defined(OS_WIN)
   if (!command_line.HasSwitch(switches::kEnableLogging))
     return;
-#endif
+#else
+  // Child processes in Windows are not able to initialize logging.
+  if (!process_type.empty())
+    return;
+#endif  // !defined(OS_WIN)
 
   logging::LoggingDestination log_mode;
   base::FilePath log_filename(FILE_PATH_LITERAL("chrome_debug.log"));
   if (command_line.GetSwitchValueASCII(switches::kEnableLogging) == "stderr") {
     log_mode = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   } else {
     base::FilePath custom_filename(
         command_line.GetSwitchValuePath(switches::kEnableLogging));
     if (custom_filename.empty()) {
       log_mode = logging::LOG_TO_ALL;
@@ skipping 24 matching lines @@
   } else {
     log_path = log_filename;
   }
 
   std::string filename;
   std::unique_ptr<base::Environment> env(base::Environment::Create());
   if (env->GetVar(kLogFileName, &filename) && !filename.empty()) {
     log_path = base::FilePath::FromUTF8Unsafe(filename);
   }
 
-  const std::string process_type =
-      command_line.GetSwitchValueASCII(switches::kProcessType);
-
   settings.logging_dest = log_mode;
   settings.log_file = log_path.value().c_str();
   settings.lock_log = logging::DONT_LOCK_LOG_FILE;
   settings.delete_old = process_type.empty() ? logging::DELETE_OLD_LOG_FILE
                                              : logging::APPEND_TO_OLD_LOG_FILE;
   bool success = logging::InitLogging(settings);
   DCHECK(success);
 }
 
 void HeadlessContentMainDelegate::InitCrashReporter(
@@ skipping 129 matching lines @@
 HeadlessContentMainDelegate::CreateContentRendererClient() {
 #if defined(CHROME_MULTIPLE_DLL_BROWSER)
   return nullptr;
 #else
   renderer_client_ = base::MakeUnique<HeadlessContentRendererClient>();
   return renderer_client_.get();
 #endif
 }
 
 }  // namespace headless