Race Create vs SendRequest on cache misses.

net/http/http_cache.cc

Index: net/http/http_cache.cc
diff --git a/net/http/http_cache.cc b/net/http/http_cache.cc
index d7461193762e31baf6c9c7608f1cc7ce345b9235..1a7e492c24b4f0ad2dd30a8b8cf2e0ad67d4f08a 100644
--- a/net/http/http_cache.cc
+++ b/net/http/http_cache.cc
@@ -30,6 +30,7 @@
 #include "net/base/net_errors.h"
 #include "net/base/upload_data_stream.h"
 #include "net/disk_cache/disk_cache.h"
+#include "net/disk_cache/pending_create_entry.h"
 #include "net/http/http_cache_transaction.h"
 #include "net/http/http_network_layer.h"
 #include "net/http/http_network_session.h"
@@ -711,7 +712,9 @@ int HttpCache::OpenEntry(const std::string& key, ActiveEntry** entry,
 
 int HttpCache::CreateEntry(const std::string& key, ActiveEntry** entry,
                            Transaction* trans) {
-  DCHECK(!FindActiveEntry(key));
+  if (FindActiveEntry(key)) {
+    return ERR_CACHE_RACE;
+  }
 
   WorkItem* item = new WorkItem(WI_CREATE_ENTRY, trans, entry);
   PendingOp* pending_op = GetPendingOp(key);
@@ -726,8 +729,8 @@ int HttpCache::CreateEntry(const std::string& key, ActiveEntry** entry,
   pending_op->callback = base::Bind(&HttpCache::OnPendingOpComplete,
                                     AsWeakPtr(), pending_op);
 
-  int rv = disk_cache_->CreateEntry(key, &(pending_op->disk_entry),
-                                    pending_op->callback);
+  int rv = disk_cache::PendingCreateEntry(disk_cache_.get(), key,
+                                          &(pending_op->disk_entry));
   if (rv != ERR_IO_PENDING) {
     item->ClearTransaction();
     pending_op->callback.Run(rv);