[omnibox] Ignore empty search suggestions.

chrome/browser/autocomplete/search_provider.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/autocomplete/search_provider.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "app/l10n_util.h"
@@ skipping 437 matching lines @@
   }
 
   ListValue* result_list = static_cast<ListValue*>(result_val);
   for (size_t i = 0; i < result_list->GetSize(); ++i) {
     Value* suggestion_val;
     string16 suggestion_str;
     if (!result_list->Get(i, &suggestion_val) ||
         !suggestion_val->GetAsString(&suggestion_str))
       return false;
 
+    // Google search may return empty suggestions for weird input characters,
+    // they make no sense at all and can cause problem in our code.
+    // See http://crbug.com/56214
+    if (!suggestion_str.length())
+      continue;
+
     Value* type_val;
     std::string type_str;
     if (type_list && type_list->Get(i, &type_val) &&
         type_val->GetAsString(&type_str) && (type_str == "NAVIGATION")) {
       Value* site_val;
       string16 site_name;
       NavigationResults& navigation_results =
           is_keyword ? keyword_navigation_results_ :
                        default_navigation_results_;
       if ((navigation_results.size() < kMaxMatches) &&
@@ skipping 314 matching lines @@
   if (input_.type() == AutocompleteInput::FORCED_QUERY)
     match.fill_into_edit.assign(L"?");
   match.fill_into_edit.append(
       AutocompleteInput::FormattedStringWithEquivalentMeaning(navigation.url,
                                                               match.contents));
   // TODO(pkasting): http://b/1112879 These should perhaps be
   // inline-autocompletable?
 
   return match;
 }