Update from https://crrev.com/306655

net/disk_cache/simple/simple_entry_impl.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_entry_impl.h"
 
 #include <algorithm>
 #include <cstring>
 #include <vector>
 
@@ skipping 1004 matching lines @@
     int64 sparse_offset,
     net::IOBuffer* buf,
     int buf_len,
     const CompletionCallback& callback) {
   DCHECK(io_thread_checker_.CalledOnValidThread());
   ScopedOperationRunner operation_runner(this);
 
   DCHECK_EQ(STATE_READY, state_);
   state_ = STATE_IO_PENDING;
 
-  int64 max_sparse_data_size = kint64max;
+  uint64 max_sparse_data_size = kint64max;
   if (backend_.get()) {
-    int64 max_cache_size = backend_->index()->max_size();
+    uint64 max_cache_size = backend_->index()->max_size();
     max_sparse_data_size = max_cache_size / kMaxSparseDataSizeDivisor;
   }
 
   scoped_ptr<SimpleEntryStat> entry_stat(
       new SimpleEntryStat(last_used_, last_modified_, data_size_,
                           sparse_data_size_));
 
   last_used_ = last_modified_ = base::Time::Now();
 
   scoped_ptr<int> result(new int());
@@ skipping 486 matching lines @@
     }
     crc32s_end_offset_[stream_index] = offset + length;
   } else if (offset < crc32s_end_offset_[stream_index]) {
     // If a range for which the crc32 was already computed is rewritten, the
     // computation of the crc32 need to start from 0 again.
     crc32s_end_offset_[stream_index] = 0;
   }
 }
 
 }  // namespace disk_cache