Fix more cases of unreachable code on Windows

pdf/pdfium/pdfium_engine.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 "pdf/pdfium/pdfium_engine.h"
 
 #include <math.h>
 
 #include "base/json/json_writer.h"
 #include "base/logging.h"
@@ skipping 257 matching lines @@
   DeleteFont
 };
 #endif  // defined(OS_LINUX)
 
 void OOM_Handler(_OOM_INFO*) {
   // Kill the process.  This is important for security, since the code doesn't
   // NULL-check many memory allocations.  If a malloc fails, returns NULL, and
   // the buffer is then used, it provides a handy mapping of memory starting at
   // address 0 for an attacker to utilize.
   abort();
-  // Paranoia, just in case.
-  *(volatile char*)0 = '\0';
 }
 
 OOM_INFO g_oom_info = {
   1,
   OOM_Handler
 };
 
 PDFiumEngine* g_engine_for_unsupported;
 
 void Unsupported_Handler(UNSUPPORT_INFO*, int type) {
@@ skipping 3090 matching lines @@
       if (page_width > *max_page_width) {
         *max_page_width = page_width;
       }
     }
   }
   FPDF_CloseDocument(doc);
   return true;
 }
 
 }  // namespace chrome_pdf