Clear the host cache when closing the last incognito window....

net/base/host_cache.h

 // Copyright (c) 2009 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.
 
 #ifndef NET_BASE_HOST_CACHE_H_
 #define NET_BASE_HOST_CACHE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 61 matching lines @@
 
   // Overwrites or creates an entry for |key|. Returns the pointer to the
   // entry, or NULL on failure (fails if caching is disabled).
   // (|error|, |addrlist|) is the value to set, and |now| is the current
   // timestamp.
   Entry* Set(const Key& key,
              int error,
              const AddressList addrlist,
              base::TimeTicks now);
 
+  // Empties the cache.
+  void clear() {
+    entries_.clear();
+  }
+
   // Returns true if this HostCache can contain no entries.
   bool caching_is_disabled() const {
     return max_entries_ == 0;
   }
 
   // Returns the number of entries in the cache.
   size_t size() const {
     return entries_.size();
   }
 
@@ skipping 35 matching lines @@
   // Map from hostname (presumably in lowercase canonicalized format) to
   // a resolved result entry.
   EntryMap entries_;
 
   DISALLOW_COPY_AND_ASSIGN(HostCache);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_HOST_CACHE_H_