Fixed all unused-variable Clang warnings on Windows.

chrome_elf/breakpad.cc

 // Copyright 2014 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.
 
 // This module contains the necessary code to register the Breakpad exception
 // handler. This implementation is based on Chrome's crash reporting code.
 
 #include "chrome_elf/breakpad.h"
 
 #include <sddl.h>
@@ skipping 18 matching lines @@
 // The protocol for connecting to the out-of-process Breakpad crash
 // reporter is different for x86-32 and x86-64: the message sizes
 // are different because the message struct contains a pointer.  As
 // a result, there are two different named pipes to connect to.  The
 // 64-bit one is distinguished with an "-x64" suffix.
 const wchar_t kChromePipeName[] = L"\\\\.\\pipe\\ChromeCrashServices\\";
 const wchar_t kGoogleUpdatePipeName[] = L"\\\\.\\pipe\\GoogleCrashServices\\";
 const wchar_t kSystemPrincipalSid[] = L"S-1-5-18";
 
 const wchar_t kNoErrorDialogs[] = L"noerrdialogs";
-const wchar_t kChromeHeadless[] = L"CHROME_HEADLESS";
 
 google_breakpad::CustomClientInfo* GetCustomInfo() {
   base::string16 process = IsNonBrowserProcess() ? L"renderer" : L"browser";
 
   wchar_t exe_path[MAX_PATH] = {};
   base::string16 channel;
   if (GetModuleFileName(NULL, exe_path, arraysize(exe_path)) &&
       IsCanary(exe_path)) {
     channel = L"canary";
   }
@@ skipping 134 matching lines @@
       google_breakpad::ExceptionHandler::HANDLER_ALL,
       dump_type,
       pipe_name.c_str(),
       GetCustomInfo());
 
   if (g_elf_breakpad->IsOutOfProcess()) {
     // Tells breakpad to handle breakpoint and single step exceptions.
     g_elf_breakpad->set_handle_debug_exceptions(true);
   }
 }