Setting chrome as the default browser is now fixed on Windows 10

chrome/browser/external_protocol/external_protocol_handler_unittest.cc

Index: chrome/browser/external_protocol/external_protocol_handler_unittest.cc
diff --git a/chrome/browser/external_protocol/external_protocol_handler_unittest.cc b/chrome/browser/external_protocol/external_protocol_handler_unittest.cc
index 53cfd6633c2a8082b30a4f915820805abb46137c..f7d3511fe47395489a47d2824ebbe24d91c73d18 100644
--- a/chrome/browser/external_protocol/external_protocol_handler_unittest.cc
+++ b/chrome/browser/external_protocol/external_protocol_handler_unittest.cc
@@ -23,11 +23,20 @@ class FakeExternalProtocolHandlerWorker
  private:
   ~FakeExternalProtocolHandlerWorker() override {}
 
-  ShellIntegration::DefaultWebClientState CheckIsDefault() override {
-    return os_state_;
+  void CheckIsDefault() override {
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(&FakeExternalProtocolHandlerWorker::OnCheckIsDefaultComplete,
+                   this, os_state_));
   }
 
-  bool SetAsDefault(bool interactive_permitted) override { return true; }
+  void SetAsDefault(bool interactive_permitted) override {
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(
+            &FakeExternalProtocolHandlerWorker::OnSetAsDefaultAttemptComplete,
+            this, AttemptResult::SUCCESS));
+  }
 
   ShellIntegration::DefaultWebClientState os_state_;
 };