Enable zygote manager by default.

base/logging.cc

 // Copyright (c) 2006-2009 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 <windows.h>
 typedef HANDLE FileHandle;
 typedef HANDLE MutexHandle;
@@ skipping 190 matching lines @@
       // try the current directory
       log_file = CreateFile(L".\\debug.log", GENERIC_WRITE,
                             FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
                             OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
       if (log_file == INVALID_HANDLE_VALUE || log_file == NULL) {
         log_file = NULL;
         return false;
       }
     }
     SetFilePointer(log_file, 0, 0, FILE_END);
-#elif defined(OS_POSIX)
+#elif defined(OS_LINUX)
     // Reserve global fd slots.
     int reserved_fds[kReservedFds];
     for (int i=0; i < kReservedFds; i++)
       reserved_fds[i] = open("/dev/null", O_RDONLY, 0);
 
     log_file = fopen(log_file_name->c_str(), "a");
 
     // Release the reserved fds.
     for (int i=0; i < kReservedFds; i++)
       close(reserved_fds[i]);
 
     if (log_file == NULL)
       return false;
+#elif defined(OS_POSIX)
+    log_file = fopen(log_file_name->c_str(), "a");
+    if (log_file == NULL)
+      return false;
 #endif
   }
 
   return true;
 }
 
 #if defined(OS_LINUX)
 int GetLoggingFileDescriptor() {
   // No locking needed, since this is only called by the zygote server,
   // which is single-threaded.
@@ skipping 348 matching lines @@
 
   CloseFile(log_file);
   log_file = NULL;
 }
 
 }  // namespace logging
 
 std::ostream& operator<<(std::ostream& out, const wchar_t* wstr) {
   return out << base::SysWideToUTF8(std::wstring(wstr));
 }