Relanding user gesture fix for external protocol handlers after revert.

apps/shell/browser/shell_extensions_browser_client.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "apps/shell/browser/shell_extensions_browser_client.h"
 
 #include "apps/common/api/generated_api.h"
 #include "apps/shell/browser/shell_app_sorting.h"
 #include "apps/shell/browser/shell_extension_system_factory.h"
 #include "apps/shell/browser/shell_extension_web_contents_observer.h"
@@ skipping 156 matching lines @@
 scoped_ptr<ExtensionHostDelegate>
 ShellExtensionsBrowserClient::CreateExtensionHostDelegate() {
   return scoped_ptr<ExtensionHostDelegate>(new ShellExtensionHostDelegate);
 }
 
 bool ShellExtensionsBrowserClient::DidVersionUpdate(BrowserContext* context) {
   // TODO(jamescook): We might want to tell extensions when app_shell updates.
   return false;
 }
 
-void ShellExtensionsBrowserClient::PermitExternalProtocolHandler() {
-}
-
 scoped_ptr<AppSorting> ShellExtensionsBrowserClient::CreateAppSorting() {
   return scoped_ptr<AppSorting>(new apps::ShellAppSorting);
 }
 
 bool ShellExtensionsBrowserClient::IsRunningInForcedAppMode() {
   return false;
 }
 
 ApiActivityMonitor* ShellExtensionsBrowserClient::GetApiActivityMonitor(
     BrowserContext* context) {
@@ skipping 11 matching lines @@
   // Generated APIs from lower-level modules.
   extensions::core_api::GeneratedFunctionRegistry::RegisterAll(registry);
   apps::api::GeneratedFunctionRegistry::RegisterAll(registry);
 
   // TODO(rockot): Remove dependency on src/chrome once we have some core APIs
   // moved out. See http://crbug.com/349042.
   extensions::api::GeneratedFunctionRegistry::RegisterAll(registry);
 }
 
 }  // namespace extensions