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

content/common/sandbox_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 "content/common/sandbox_win.h"
 
 #include <string>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
@@ skipping 796 matching lines @@
                                       "Process.Sandbox.Launch.Error",
                                   last_error);
     } else
       DLOG(ERROR) << "Failed to launch process. Error: " << result;
 
     return base::Process();
   }
 
   delegate->PostSpawnTarget(target.process_handle());
 
-  CHECK(ResumeThread(target.thread_handle()) != -1);
+  CHECK(ResumeThread(target.thread_handle()) != static_cast<DWORD>(-1));
   return base::Process(target.TakeProcessHandle());
 }
 
 bool BrokerDuplicateHandle(HANDLE source_handle,
                            DWORD target_process_id,
                            HANDLE* target_handle,
                            DWORD desired_access,
                            DWORD options) {
   // If our process is the target just duplicate the handle.
   if (::GetCurrentProcessId() == target_process_id) {
@@ skipping 21 matching lines @@
   }
 
   return false;
 }
 
 bool BrokerAddTargetPeer(HANDLE peer_process) {
   return g_broker_services->AddTargetPeer(peer_process) == sandbox::SBOX_ALL_OK;
 }
 
 }  // namespace content