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

net/disk_cache/simple/simple_entry_operation.h

Index: net/disk_cache/simple/simple_entry_operation.h
diff --git a/net/disk_cache/simple/simple_entry_operation.h b/net/disk_cache/simple/simple_entry_operation.h
index acdd60a3207e59324432e650e94a11905a930d0c..1c78701722924f243bdbf058f35e782437b5dd06 100644
--- a/net/disk_cache/simple/simple_entry_operation.h
+++ b/net/disk_cache/simple/simple_entry_operation.h
@@ -31,6 +31,7 @@ class SimpleEntryOperation {
     TYPE_CLOSE = 2,
     TYPE_READ = 3,
     TYPE_WRITE = 4,
+    TYPE_DOOM = 5,
   };
 
   SimpleEntryOperation(const SimpleEntryOperation& other);
@@ -63,6 +64,10 @@ class SimpleEntryOperation {
       bool optimistic,
       const CompletionCallback& callback);
 
+  static SimpleEntryOperation DoomOperation(
+      SimpleEntryImpl* entry,
+      const CompletionCallback& callback);
+
   bool ConflictsWith(const SimpleEntryOperation& other_op) const;
   // Releases all references. After calling this operation, SimpleEntryOperation
   // will only hold POD members.