Remove old default search preferences.

components/search_engines/default_search_policy_handler.h

Index: components/search_engines/default_search_policy_handler.h
diff --git a/components/search_engines/default_search_policy_handler.h b/components/search_engines/default_search_policy_handler.h
index 499d5a4f0bc0682e59bb1d9e94c9681a029d829c..3840826ce71658cd04cb0873c658aaf8537f8f2e 100644
--- a/components/search_engines/default_search_policy_handler.h
+++ b/components/search_engines/default_search_policy_handler.h
@@ -13,21 +13,6 @@
 
 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: