Remove old default search preferences.

components/search_engines/default_search_policy_handler.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_POLICY_HANDLER_H_
 #define COMPONENTS_SEARCH_ENGINES_DEFAULT_SEARCH_POLICY_HANDLER_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "components/policy/core/browser/configuration_policy_handler.h"
 
 namespace policy {
 
-// ConfigurationPolicyHandler for the DefaultSearchEncodings policy.
-class DefaultSearchEncodingsPolicyHandler
-    : public TypeCheckingPolicyHandler {
- public:
-  DefaultSearchEncodingsPolicyHandler();
-  ~DefaultSearchEncodingsPolicyHandler() override;
-
-  // ConfigurationPolicyHandler methods:
-  void ApplyPolicySettings(const PolicyMap& policies,
-                           PrefValueMap* prefs) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(DefaultSearchEncodingsPolicyHandler);
-};
-
 // ConfigurationPolicyHandler for the default search policies.
 class DefaultSearchPolicyHandler : public ConfigurationPolicyHandler {
  public:
   DefaultSearchPolicyHandler();
   ~DefaultSearchPolicyHandler() override;
 
   // ConfigurationPolicyHandler methods:
   bool CheckPolicySettings(const PolicyMap& policies,
                            PolicyErrorMap* errors) override;
   void ApplyPolicySettings(const PolicyMap& policies,
                            PrefValueMap* prefs) override;
 
  private:
-  // Calls |CheckPolicySettings()| on each of the handlers in |handlers_|
-  // and returns whether all of the calls succeeded.
+  // Checks that value type is valid for each policy and returns whether all of
+  // the policies are valid.
   bool CheckIndividualPolicies(const PolicyMap& policies,
                                PolicyErrorMap* errors);
 
   // Returns whether there is a value for |policy_name| in |policies|.
   bool HasDefaultSearchPolicy(const PolicyMap& policies,
                               const char* policy_name);
 
   // Returns whether any default search policies are specified in |policies|.
   bool AnyDefaultSearchPoliciesSpecified(const PolicyMap& policies);
 
   // Returns whether the default search provider is disabled.
   bool DefaultSearchProviderIsDisabled(const PolicyMap& policies);
 
   // Returns whether the default search URL is set and valid.  On success, both
   // outparams (which must be non-NULL) are filled with the search URL.
   bool DefaultSearchURLIsValid(const PolicyMap& policies,
                                const base::Value** url_value,
                                std::string* url_string);
 
   // Make sure that the |path| is present in |prefs_|.  If not, set it to
   // a blank string.
   void EnsureStringPrefExists(PrefValueMap* prefs, const std::string& path);
 
   // Make sure that the |path| is present in |prefs_| and is a ListValue.  If
   // not, set it to an empty list.
   void EnsureListPrefExists(PrefValueMap* prefs, const std::string& path);
 
-  // The ConfigurationPolicyHandler handlers for each default search policy.
-  std::vector<std::unique_ptr<TypeCheckingPolicyHandler>> handlers_;
-
   DISALLOW_COPY_AND_ASSIGN(DefaultSearchPolicyHandler);
 };
 
 }  // namespace policy
 
 #endif  // COMPONENTS_SEARCH_ENGINES_DEFAULT_SEARCH_POLICY_HANDLER_H_