Misc. cleanup, primarily removing unused locals.

net/disk_cache/simple/simple_util.cc

 // Copyright (c) 2013 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 "net/disk_cache/simple/simple_util.h"
 
 #include <limits>
 
 #include "base/files/file_util.h"
 #include "base/format_macros.h"
 #include "base/logging.h"
+#include "base/numerics/safe_conversions.h"
 #include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "net/disk_cache/simple/simple_entry_format.h"
 
 namespace {
 
 // Size of the uint64 hash_key number in Hex format in a string.
@@ skipping 68 matching lines @@
 
 std::string GetFilenameFromKeyAndFileIndex(const std::string& key,
                                            int file_index) {
   return GetEntryHashKeyAsHexString(key) +
          base::StringPrintf("_%1d", file_index);
 }
 
 int32 GetDataSizeFromKeyAndFileSize(const std::string& key, int64 file_size) {
   int64 data_size = file_size - key.size() - sizeof(SimpleFileHeader) -
                     sizeof(SimpleFileEOF);
-  DCHECK_GE(implicit_cast<int64>(std::numeric_limits<int32>::max()), data_size);
-  return data_size;
+  return base::checked_cast<int32>(data_size);
 }
 
 int64 GetFileSizeFromKeyAndDataSize(const std::string& key, int32 data_size) {
   return data_size + key.size() + sizeof(SimpleFileHeader) +
       sizeof(SimpleFileEOF);
 }
 
 int GetFileIndexFromStreamIndex(int stream_index) {
   return (stream_index == 2) ? 1 : 0;
 }
@@ skipping 18 matching lines @@
   base::File::Info file_info;
   if (!base::GetFileInfo(path, &file_info))
     return false;
   *out_mtime = file_info.last_modified;
   return true;
 }
 
 }  // namespace simple_backend
 
 }  // namespace disk_cache