Fix error handling in OpenProcess wrappers.

base/process_util_win.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/process_util.h"
 
 #include <fcntl.h>
 #include <io.h>
 #include <windows.h>
 #include <userenv.h>
@@ skipping 173 matching lines @@
   return hinst;
 }
 
 bool OpenProcessHandle(ProcessId pid, ProcessHandle* handle) {
   // We try to limit privileges granted to the handle. If you need this
   // for test code, consider using OpenPrivilegedProcessHandle instead of
   // adding more privileges here.
   ProcessHandle result = OpenProcess(PROCESS_DUP_HANDLE | PROCESS_TERMINATE,
                                      FALSE, pid);
 
-  if (result == INVALID_HANDLE_VALUE)
+  if (result == NULL)
     return false;
 
   *handle = result;
   return true;
 }
 
 bool OpenPrivilegedProcessHandle(ProcessId pid, ProcessHandle* handle) {
   ProcessHandle result = OpenProcess(PROCESS_DUP_HANDLE |
                                      PROCESS_TERMINATE |
                                      PROCESS_QUERY_INFORMATION |
                                      PROCESS_VM_READ |
                                      SYNCHRONIZE,
                                      FALSE, pid);
 
-  if (result == INVALID_HANDLE_VALUE)
+  if (result == NULL)
     return false;
 
   *handle = result;
   return true;
 }
 
 bool OpenProcessHandleWithAccess(ProcessId pid,
                                  uint32 access_flags,
                                  ProcessHandle* handle) {
   ProcessHandle result = OpenProcess(access_flags, FALSE, pid);
 
-  if (result == INVALID_HANDLE_VALUE)
+  if (result == NULL)
     return false;
 
   *handle = result;
   return true;
 }
 
 void CloseProcessHandle(ProcessHandle process) {
   CloseHandle(process);
 }
 
@@ skipping 770 matching lines @@
 
   PERFORMANCE_INFORMATION info;
   if (!InternalGetPerformanceInfo(&info, sizeof(info))) {
     DLOG(ERROR) << "Failed to fetch internal performance info.";
     return 0;
   }
   return (info.CommitTotal * system_info.dwPageSize) / 1024;
 }
 
 }  // namespace base