Update from https://crrev.com/328418

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 <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"
 
 namespace {
 
-const int kBufferSize = 1024;
-
 // Returns whether |path|'s MD5 was successfully written to |digest_string|.
 bool MD5Sum(const char* path, std::string* digest_string) {
-  std::ifstream stream(path);
-  if (!stream.good()) {
+  base::ScopedFILE file(fopen(path, "rb"));
+  if (!file) {
     LOG(ERROR) << "Could not open file " << path;
     return false;
   }
   base::MD5Context ctx;
   base::MD5Init(&ctx);
-  char buf[kBufferSize];
-  while (stream.good()) {
-    std::streamsize bytes_read = stream.readsome(buf, sizeof(buf));
-    if (bytes_read == 0)
-      break;
-    base::MD5Update(&ctx, base::StringPiece(buf, bytes_read));
-  }
-  if (stream.fail()) {
+  const size_t kBufferSize = 1 << 16;
+  scoped_ptr<char[]> buf(new char[kBufferSize]);
+  size_t len;
+  while ((len = fread(buf.get(), 1, kBufferSize, file.get())) > 0)
+    base::MD5Update(&ctx, base::StringPiece(buf.get(), len));
+  if (ferror(file.get())) {
     LOG(ERROR) << "Error reading file " << path;
     return false;
   }
   base::MD5Digest digest;
   base::MD5Final(&digest, &ctx);
   *digest_string = base::MD5DigestToBase16(digest);
   return true;
 }
 
 // Returns the set of all files contained in |files|. This handles directories
@@ skipping 34 matching lines @@
   for (std::set<std::string>::const_iterator it = files.begin();
        it != files.end(); ++it) {
     if (!MD5Sum(it->c_str(), &digest))
       failed = true;
     base::FilePath file_path(*it);
     std::cout << digest << "  "
               << base::MakeAbsoluteFilePath(file_path).value() << std::endl;
   }
   return failed;
 }