Don't doom the wrong simple cache entry.

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 235 matching lines @@
   // have the entry in the index but we don't have the created files yet, this
   // way we never leak files. CreationOperationComplete will remove the entry
   // from the index if the creation fails.
   backend_->index()->Insert(entry_hash_);
 
   RunNextOperationIfNeeded();
   return ret_value;
 }
 
 int SimpleEntryImpl::DoomEntry(const CompletionCallback& callback) {
+  if (doomed_)
+    return net::OK;
   net_log_.AddEvent(net::NetLog::TYPE_SIMPLE_CACHE_ENTRY_DOOM_CALL);
   net_log_.AddEvent(net::NetLog::TYPE_SIMPLE_CACHE_ENTRY_DOOM_BEGIN);
 
   MarkAsDoomed();
   pending_operations_.push(SimpleEntryOperation::DoomOperation(this, callback));
   RunNextOperationIfNeeded();
   return net::ERR_IO_PENDING;
 }
 
 void SimpleEntryImpl::SetKey(const std::string& key) {
@@ skipping 256 matching lines @@
   *out_entry = this;
 }
 
 void SimpleEntryImpl::RemoveSelfFromBackend() {
   if (!backend_.get())
     return;
   backend_->OnDeactivated(this);
 }
 
 void SimpleEntryImpl::MarkAsDoomed() {
+  doomed_ = true;
   if (!backend_.get())
     return;
-  doomed_ = true;
   backend_->index()->Remove(entry_hash_);
   RemoveSelfFromBackend();
 }
 
 void SimpleEntryImpl::RunNextOperationIfNeeded() {
   DCHECK(io_thread_checker_.CalledOnValidThread());
   SIMPLE_CACHE_UMA(CUSTOM_COUNTS,
                    "EntryOperationsPending", cache_type_,
                    pending_operations_.size(), 0, 100, 20);
   if (!pending_operations_.empty() && state_ != STATE_IO_PENDING) {
@@ skipping 680 matching lines @@
       type = conflicting ? WRITE_FOLLOWS_CONFLICTING_WRITE
                          : WRITE_FOLLOWS_NON_CONFLICTING_WRITE;
     }
   }
   SIMPLE_CACHE_UMA(ENUMERATION,
                    "WriteDependencyType", cache_type_,
                    type, WRITE_DEPENDENCY_TYPE_MAX);
 }
 
 }  // namespace disk_cache