Fix IWYU violators that don't include scoped_ptr.h in Android build.

tools/android/md5sum/md5sum.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.
 
 // Md5sum implementation for Android. This version handles files as well as
 // directories. Its output is sorted by file path.
 
 #include <stddef.h>
 
 #include <fstream>
 #include <iostream>
 #include <set>
 #include <string>
 
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/md5.h"
+#include "base/memory/scoped_ptr.h"
 
 namespace {
 
 // Returns whether |path|'s MD5 was successfully written to |digest_string|.
 bool MD5Sum(const char* path, std::string* digest_string) {
   base::ScopedFILE file(fopen(path, "rb"));
   if (!file) {
     LOG(ERROR) << "Could not open file " << path;
     return false;
   }
@@ skipping 51 matching lines @@
   for (std::set<std::string>::const_iterator it = files.begin();
        it != files.end(); ++it) {
     if (!MD5Sum(it->c_str(), &digest)) {
       failed = true;
     } else {
       std::cout << digest << "  " << *it << std::endl;
     }
   }
   return failed;
 }