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 34651e1d23c6788946502e25dd1c7f5a7e577591..44a844101ac92b0b0a0716961cc7ccfaceda439b 100644
--- a/chrome/browser/shell_integration_win.h
+++ b/chrome/browser/shell_integration_win.h
@@ -34,6 +34,13 @@ 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);
+
 }  // namespace win
 }  // namespace shell_integration