win/clang: Fix all remaining -Wformat warnings.

cloud_print/virtual_driver/win/install/setup.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 <iomanip>
 #include <windows.h>
 #include <winspool.h>
 #include <setupapi.h>  // Must be included after windows.h
 
 #include "base/at_exit.h"
@@ skipping 327 matching lines @@
   // None of the print API structures likes constant strings even though they
   // don't modify the string.  const_casting is the cleanest option.
   base::string16 driver_name = LoadLocalString(IDS_DRIVER_NAME);
   printer_info.pDriverName = const_cast<LPWSTR>(driver_name.c_str());
   printer_info.pPrinterName = const_cast<LPWSTR>(driver_name.c_str());
   printer_info.pComment =  const_cast<LPWSTR>(driver_name.c_str());
   printer_info.pLocation = const_cast<LPWSTR>(kGcpUrl);
   base::string16 port_name;
   printer_info.pPortName = const_cast<LPWSTR>(kPortName);
   printer_info.Attributes = PRINTER_ATTRIBUTE_DIRECT|PRINTER_ATTRIBUTE_LOCAL;
-  printer_info.pPrintProcessor = L"winprint";
+  printer_info.pPrintProcessor = const_cast<LPWSTR>(L"winprint");
   HANDLE handle = AddPrinter(NULL, 2, reinterpret_cast<BYTE*>(&printer_info));
   if (handle == NULL) {
     HRESULT result = GetLastHResult();
     LOG(ERROR) << "Unable to add printer";
     return result;
   }
   ClosePrinter(handle);
   return S_OK;
 }
 
@@ skipping 191 matching lines @@
 
   VLOG(0) << GetErrorMessage(retval)
           << " HRESULT=0x" << std::setbase(16) << retval;
 
   // Installer is silent by default as required by Google Update.
   if (CommandLine::ForCurrentProcess()->HasSwitch("verbose")) {
     DisplayWindowsMessage(NULL, retval, LoadLocalString(IDS_DRIVER_NAME));
   }
   return retval;
 }