Replaced ptrdiff_t with std::ptrdiff_t in all files to enable build with gcc-4.6.0.

third_party/tcmalloc/chromium/src/windows/port.cc

 /* Copyright (c) 2007, Google Inc.
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  * 
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 59 matching lines @@
   static int pagesize = 0;
   if (pagesize == 0) {
     SYSTEM_INFO system_info;
     GetSystemInfo(&system_info);
     pagesize = std::max(system_info.dwPageSize,
                         system_info.dwAllocationGranularity);
   }
   return pagesize;
 }
 
-extern "C" PERFTOOLS_DLL_DECL void* __sbrk(ptrdiff_t increment) {
+extern "C" PERFTOOLS_DLL_DECL void* __sbrk(std::ptrdiff_t increment) {
   LOG(FATAL, "Windows doesn't implement sbrk!\n");
   return NULL;
 }
 
 // -----------------------------------------------------------------------
 // Threads code
 
 bool CheckIfKernelSupportsTLS() {
   // TODO(csilvers): return true (all win's since win95, at least, support this)
   return false;
@@ skipping 206 matching lines @@
       if ((strlen(fname) >= prefix_length) &&
           (memcmp(fname, prefix, prefix_length) == 0)) {
         RAW_VLOG(0, "Removing old heap profile %s\n", fname);
         // TODO(csilvers): we really need to unlink dirname + fname
         _unlink(fname);
       }
     } while (FindNextFileA(hFind, &found) != FALSE);  // A is for Ansi
     FindClose(hFind);
   }
 }