Fixed invalid return value.

printing/backend/print_backend_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 "printing/backend/print_backend.h"
 
 #include <algorithm>
 #include <objidl.h>
 #include <winspool.h>
 
@@ skipping 165 matching lines @@
   return true;
 }
 
 // Gets the information about driver for a specific printer.
 std::string PrintBackendWin::GetPrinterDriverInfo(
     const std::string& printer_name) {
   std::string driver_info;
   ScopedPrinterHandle printer_handle;
   if (!::OpenPrinter(const_cast<LPTSTR>(UTF8ToWide(printer_name).c_str()),
                      printer_handle.Receive(), NULL)) {
-    return false;
+    return driver_info;
   }
   DCHECK(printer_handle.IsValid());
   DWORD bytes_needed = 0;
   ::GetPrinterDriver(printer_handle, NULL, 6, NULL, 0, &bytes_needed);
   scoped_array<BYTE> driver_info_buffer(new BYTE[bytes_needed]);
   if (!bytes_needed || !driver_info_buffer.get())
-    return false;
+    return driver_info;
   if (!::GetPrinterDriver(printer_handle, NULL, 6, driver_info_buffer.get(),
                           bytes_needed, &bytes_needed)) {
-    return false;
+    return driver_info;
   }
   if (!bytes_needed)
-    return false;
+    return driver_info;
   const DRIVER_INFO_6* driver_info_6 =
       reinterpret_cast<DRIVER_INFO_6*>(driver_info_buffer.get());
 
   std::string info[4];
 
   if (driver_info_6->pName)
     info[0] = WideToUTF8(driver_info_6->pName);
 
   if (driver_info_6->pDriverPath) {
     scoped_ptr<FileVersionInfo> version_info(
@@ skipping 19 matching lines @@
               printer_handle.Receive(), NULL);
   return printer_handle.IsValid();
 }
 
 scoped_refptr<PrintBackend> PrintBackend::CreateInstance(
     const base::DictionaryValue* print_backend_settings) {
   return new PrintBackendWin;
 }
 
 }  // namespace printing