Move thread_pool.h into utils so it can be shared by more than one example.

native_client_sdk/src/libraries/nacl_io/mount_http.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 "nacl_io/mount_http.h"
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <ppapi/c/pp_errors.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <vector>
 #include "nacl_io/mount_node_dir.h"
 #include "nacl_io/osinttypes.h"
-#include "utils/auto_lock.h"
+#include "sdk_util/auto_lock.h"
 
 #if defined(WIN32)
 #define snprintf _snprintf
 #endif
 
 
 namespace {
 
 typedef std::vector<char *> StringList_t;
 size_t SplitString(char *str, const char *delim, StringList_t* list) {
@@ skipping 763 matching lines @@
     off_t len = manifest_node->Read(0, text, manifest_node->GetSize());
     manifest_node->Release();
 
     text[len] = 0;
     return text;
   }
 
   fprintf(stderr, "Could not open manifest: %s\n", manifest_name.c_str());
   return NULL;
 }