Fix race condition for non-open/create operations happening after a doom.

net/disk_cache/backend_unittest.cc

Index: net/disk_cache/backend_unittest.cc
diff --git a/net/disk_cache/backend_unittest.cc b/net/disk_cache/backend_unittest.cc
index 7eeeee1fd83200c90b0dc1a2775f4654fd903a2f..c9738d007a4748a5595d9adab8cd4a99ebd5fc94 100644
--- a/net/disk_cache/backend_unittest.cc
+++ b/net/disk_cache/backend_unittest.cc
@@ -2682,15 +2682,15 @@ void DiskCacheBackendTest::BackendDoomAll() {
   base::MessageLoop::current()->RunUntilIdle();
 
   disk_cache::Entry *entry3, *entry4;
+  entry1->Close();
   EXPECT_NE(net::OK, OpenEntry("third", &entry3));
   ASSERT_EQ(net::OK, CreateEntry("third", &entry3));
+  entry2->Close();
   ASSERT_EQ(net::OK, CreateEntry("fourth", &entry4));
 
   EXPECT_EQ(net::OK, DoomAllEntries());
   ASSERT_EQ(0, cache_->GetEntryCount());
 
-  entry1->Close();
-  entry2->Close();
   entry3->Doom();  // The entry should be already doomed, but this must work.
   entry3->Close();
   entry4->Close();