DefaultBrowserWorker now fully supports opening the settings for Win10

chrome/browser/custom_handlers/protocol_handler_registry_unittest.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/custom_handlers/protocol_handler_registry.h"
 
 #include <stddef.h>
 
 #include <set>
 
@@ skipping 136 matching lines @@
         force_failure_(force_failure) {}
 
  private:
   ~FakeProtocolClientWorker() override = default;
 
   shell_integration::DefaultWebClientState CheckIsDefaultImpl() override {
     return force_failure_ ? shell_integration::NOT_DEFAULT
                           : shell_integration::IS_DEFAULT;
   }
 
-  void SetAsDefaultImpl() override {}
+  void SetAsDefaultImpl(const base::Closure& on_finished_callback) override {
+    on_finished_callback.Run();
+  }
 
  private:
   bool force_failure_;
 };
 
 class FakeDelegate : public ProtocolHandlerRegistry::Delegate {
  public:
   FakeDelegate() : force_os_failure_(false) {}
   ~FakeDelegate() override {}
   void RegisterExternalHandler(const std::string& protocol) override {
@@ skipping 909 matching lines @@
   // added to pref.
   ASSERT_EQ(InPrefIgnoredHandlerCount(), 2);
   ASSERT_EQ(InMemoryIgnoredHandlerCount(), 4);
 
   registry()->RemoveIgnoredHandler(p2u1);
 
   // p2u1 installed by user and policy, so it is removed from pref alone.
   ASSERT_EQ(InPrefIgnoredHandlerCount(), 1);
   ASSERT_EQ(InMemoryIgnoredHandlerCount(), 4);
 }