Revert of Fix the handling of user gestures for external protocol handler dialogs.

extensions/browser/extensions_browser_client.h

Index: extensions/browser/extensions_browser_client.h
diff --git a/extensions/browser/extensions_browser_client.h b/extensions/browser/extensions_browser_client.h
index 7616d5cb63f20e3f8772b45a96fa2ad849e83c59..df17516a0fde7467e591882dd04392615d43d4c4 100644
--- a/extensions/browser/extensions_browser_client.h
+++ b/extensions/browser/extensions_browser_client.h
@@ -148,6 +148,10 @@ class ExtensionsBrowserClient {
   // version for later comparison.
   virtual bool DidVersionUpdate(content::BrowserContext* context) = 0;
 
+  // Permits an external protocol handler to be launched. See
+  // ExternalProtocolHandler::PermitLaunchUrl() in Chrome.
+  virtual void PermitExternalProtocolHandler() = 0;
+
   // Creates a new AppSorting instance.
   virtual scoped_ptr<AppSorting> CreateAppSorting() = 0;