Fix TemplateUrl::MatchesData comparison of search_terms_replacement_key (reland)

components/search_engines/default_search_manager.h

 // Copyright 2014 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 COMPONENTS_SEARCH_ENGINES_DEFAULT_SEARCH_MANAGER_H_
 #define COMPONENTS_SEARCH_ENGINES_DEFAULT_SEARCH_MANAGER_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 45 matching lines @@
   static const char kLastModified[];
   static const char kLastVisited[];
 
   static const char kUsageCount[];
   static const char kAlternateURLs[];
   static const char kSearchTermsReplacementKey[];
   static const char kCreatedByPolicy[];
   static const char kDisabledByPolicy[];
 
   enum Source {
+    // Default search engine chosen either from prepopulated engines set for
+    // current country or overriden from kSearchProviderOverrides preference.
     FROM_FALLBACK = 0,
+    // User selected engine.
     FROM_USER,
+    // Search engine set by extension overriding default search.
     FROM_EXTENSION,
+    // Search engine controlled externally through enterprise configuration
+    // management (e.g. windows group policy).
     FROM_POLICY,
   };
 
   typedef base::Callback<void(const TemplateURLData*, Source)> ObserverCallback;
 
   DefaultSearchManager(PrefService* pref_service,
                        const ObserverCallback& change_observer);
 
   ~DefaultSearchManager();
 
@@ skipping 79 matching lines @@
   // prefs). This will be null if no value was set in the pref store.
   std::unique_ptr<TemplateURLData> prefs_default_search_;
 
   // True if the default search is currently enforced by policy.
   bool default_search_controlled_by_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultSearchManager);
 };
 
 #endif  // COMPONENTS_SEARCH_ENGINES_DEFAULT_SEARCH_MANAGER_H_