autocomplete: Add AutocompleteProvider::Type enum.

chrome/browser/autocomplete/zero_suggest_provider.cc

 // Copyright (c) 2012 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/zero_suggest_provider.h"
 
 #include "base/callback.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/string16.h"
 #include "base/string_util.h"
@@ skipping 14 matching lines @@
 
 namespace {
 // The relevance of the top match from this provider.
 const int kMaxZeroSuggestRelevance = 100;
 }  // namespace
 
 ZeroSuggestProvider::ZeroSuggestProvider(
   AutocompleteProviderListener* listener,
   Profile* profile,
   const std::string& url_prefix)
-    : AutocompleteProvider(listener, profile, "ZeroSuggest"),
+    : AutocompleteProvider(listener,
+                           profile,
+                           AutocompleteProvider::TYPE_ZERO_SUGGEST),
       url_prefix_(url_prefix),
       template_url_service_(TemplateURLServiceFactory::GetForProfile(profile)) {
 }
 
 void ZeroSuggestProvider::Start(const AutocompleteInput& input,
                                 bool /*minimal_changes*/) {
   UpdateMatches(input.text());
 }
 
 void ZeroSuggestProvider::StartZeroSuggest(const GURL& url,
@@ skipping 168 matching lines @@
     // Style to look like normal search suggestions.
     match.contents_class.push_back(
        ACMatchClassification(0, ACMatchClassification::DIM));
     match.contents_class.push_back(
        ACMatchClassification(user_text_.length(), ACMatchClassification::NONE));
   }
   match.transition = content::PAGE_TRANSITION_GENERATED;
 
   matches_.push_back(match);
 }