AutoFill DCHECK in RenderViewHost::AutocompleteSuggestionsReturned fails.

chrome/browser/renderer_host/render_view_host.cc

 // Copyright (c) 2010 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 "chrome/browser/renderer_host/render_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 1641 matching lines @@
   autofill_query_id_ = query_id;
   autofill_values_.clear();
   autofill_values_.insert(autofill_values_.begin(), names.begin(), names.end());
   autofill_labels_.clear();
   autofill_labels_.insert(
       autofill_labels_.begin(), labels.begin(), labels.end());
 }
 
 void RenderViewHost::AutocompleteSuggestionsReturned(
     int query_id, const std::vector<string16>& suggestions) {
-  DCHECK_EQ(autofill_query_id_, query_id);
+  // When query ids match we are responding to an AutoFill and Autocomplete
+  // combined query response.
+  // Otherwise Autocomplete is cancelling, so we only send suggestions (usually
+  // an empty list).
+  if (autofill_query_id_ != query_id) {
+    // Autocomplete is cancelling.
+    autofill_values_.clear();
+    autofill_labels_.clear();
+  }
 
   // Combine AutoFill and Autocomplete values into values and labels.
   for (size_t i = 0; i < suggestions.size(); ++i) {
     autofill_values_.push_back(suggestions[i]);
     autofill_labels_.push_back(string16());
   }
   Send(new ViewMsg_AutoFillSuggestionsReturned(
       routing_id(), query_id, autofill_values_, autofill_labels_));
 }
 
@@ skipping 254 matching lines @@
                                            const string16& name,
                                            const string16& display_name,
                                            unsigned long estimated_size,
                                            bool blocked_by_policy) {
   RenderViewHostDelegate::ContentSettings* content_settings_delegate =
       delegate_->GetContentSettingsDelegate();
   if (content_settings_delegate)
     content_settings_delegate->OnWebDatabaseAccessed(
         url, name, display_name, estimated_size, blocked_by_policy);
 }