Preventing our default handlers for ChromeOS to show up or confuse the user

chrome/browser/custom_handlers/protocol_handler_registry.h

Index: chrome/browser/custom_handlers/protocol_handler_registry.h
diff --git a/chrome/browser/custom_handlers/protocol_handler_registry.h b/chrome/browser/custom_handlers/protocol_handler_registry.h
index edfb7ab6327372f319afaec84e7d5fe26b2650a6..9030b2ab118f4911f6ff3da7659c00897770a864 100644
--- a/chrome/browser/custom_handlers/protocol_handler_registry.h
+++ b/chrome/browser/custom_handlers/protocol_handler_registry.h
@@ -194,6 +194,9 @@ class ProtocolHandlerRegistry
  private:
   friend class base::RefCountedThreadSafe<ProtocolHandlerRegistry>;
 
+  // Install the default handlers.
+  void InstallFixedHandlers();
+
   // Puts the given handler at the top of the list of handlers for its
   // protocol.
   void PromoteHandler(const ProtocolHandler& handler);