Fix registerProtocolHandler implementation on Windows 8 and 10.

chrome/browser/shell_integration_win.h

Index: chrome/browser/shell_integration_win.h
diff --git a/chrome/browser/shell_integration_win.h b/chrome/browser/shell_integration_win.h
index cde146264b0de7b64802915ff8da7b394e1c971e..ab1695bd1a0de7d6de20bf3481ed9321b0a61ba5 100644
--- a/chrome/browser/shell_integration_win.h
+++ b/chrome/browser/shell_integration_win.h
@@ -36,6 +36,13 @@ void SetAsDefaultBrowserUsingSystemSettings(
 // dialog will be shown and this method returns true.
 bool SetAsDefaultProtocolClientUsingIntentPicker(const std::string& protocol);
 
+// Initiates the interaction with the system settings for the default handler of
+// |protocol|. The function takes care of making sure |on_finished_callback|
+// will get called exactly once when the interaction is finished.
+void SetAsDefaultProtocolClientUsingSystemSettings(
+    const std::string& protocol,
+    const base::Closure& on_finished_callback);
+
 // Generates an application user model ID (AppUserModelId) for a given app
 // name and profile path. The returned app id is in the format of
 // "|app_name|[.<profile_id>]". "profile_id" is appended when user override