clang/win: Let some chromium_code targets build with -Wextra.

components/crash/content/app/hard_error_handler_win.cc

 // Copyright 2013 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 "components/crash/content/app/hard_error_handler_win.h"
 
 #include <DelayIMP.h>
 #include <winternl.h>
 
 #include "base/basictypes.h"
@@ skipping 15 matching lines @@
 const DWORD NT_STATUS_DLL_NOT_FOUND = 0xC0000135;
 
 // We assume that exception codes are NT_STATUS codes.
 DWORD FacilityFromException(DWORD exception_code) {
   return (exception_code >> 16) & 0x0FFF;
 }
 
 // This is not a generic function. It only works with some |nt_status| values.
 // Check the strings here http://msdn.microsoft.com/en-us/library/cc704588.aspx
 // before attempting to use this function.
-void RaiseHardErrorMsg(long nt_status, const std::string& p1,
-                                       const std::string& p2) {
+void RaiseHardErrorMsg(DWORD nt_status,
+                       const std::string& p1,
+                       const std::string& p2) {
   // If headless just exit silently.
   if (GetCrashReporterClient()->IsRunningUnattended())
     return;
 
   HMODULE ntdll = ::GetModuleHandleA("NTDLL.DLL");
   wchar_t* msg_template = NULL;
   size_t count = ::FormatMessage(
       FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS |
       FORMAT_MESSAGE_FROM_HMODULE,
       ntdll,
@@ skipping 40 matching lines @@
 }
 
 }  // namespace
 
 bool HardErrorHandler(EXCEPTION_POINTERS* ex_info) {
   if (!ex_info)
     return false;
   if (!ex_info->ExceptionRecord)
     return false;
 
-  long exception = ex_info->ExceptionRecord->ExceptionCode;
+  DWORD exception = ex_info->ExceptionRecord->ExceptionCode;
   if (exception == kExceptionModuleNotFound) {
     ModuleNotFoundHardError(ex_info->ExceptionRecord);
     return true;
   } else if (exception == kExceptionEntryPtNotFound) {
     EntryPointNotFoundHardError(ex_info->ExceptionRecord);
     return true;
   } else if (FacilityFromException(exception) == FACILITY_GRAPHICS_KERNEL) {
     RaiseHardErrorMsg(exception, std::string(), std::string());
     return true;
   }
   return false;
 }
 
 }  // namespace breakpad