Updating DCHECK() to DCHECK_GE() in base/ dir

base/shared_memory_posix.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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/shared_memory.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ skipping 273 matching lines @@
 
   FilePath temp_dir;
   if (!file_util::GetShmemTempDir(&temp_dir))
     return false;
 
   *path = temp_dir.AppendASCII("com.google.chrome.shmem." + mem_name);
   return true;
 }
 
 void SharedMemory::LockOrUnlockCommon(int function) {
-  DCHECK(mapped_file_ >= 0);
+  DCHECK_GE(mapped_file_, 0);
   while (lockf(mapped_file_, function, 0) < 0) {
     if (errno == EINTR) {
       continue;
     } else if (errno == ENOLCK) {
       // temporary kernel resource exaustion
       base::PlatformThread::Sleep(500);
       continue;
     } else {
       NOTREACHED() << "lockf() failed."
                    << " function:" << function
                    << " fd:" << mapped_file_
                    << " errno:" << errno
                    << " msg:" << safe_strerror(errno);
     }
   }
 }
 
 bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
                                         SharedMemoryHandle *new_handle,
                                         bool close_self) {
   const int new_fd = dup(mapped_file_);
-  DCHECK(new_fd >= 0);
+  DCHECK_GE(new_fd, 0);
   new_handle->fd = new_fd;
   new_handle->auto_close = true;
 
   if (close_self)
     Close();
 
   return true;
 }
 
 }  // namespace base