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

extensions/browser/extension_function_dispatcher.cc

 // Copyright 2014 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 "extensions/browser/extension_function_dispatcher.h"
 
 #include "base/bind.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 364 matching lines @@
   ExtensionSystem* extension_system = ExtensionSystem::Get(browser_context_);
   QuotaService* quota = extension_system->quota_service();
   std::string violation_error = quota->Assess(extension->id(),
                                               function.get(),
                                               &params.arguments,
                                               base::TimeTicks::Now());
 
   if (violation_error.empty()) {
     scoped_ptr<base::ListValue> args(params.arguments.DeepCopy());
 
+    // See crbug.com/39178.
+    ExtensionsBrowserClient::Get()->PermitExternalProtocolHandler();
     NotifyApiFunctionCalled(
         extension->id(), params.name, args.Pass(), browser_context_);
     UMA_HISTOGRAM_SPARSE_SLOWLY("Extensions.FunctionCalls",
                                 function->histogram_value());
     function->Run()->Execute();
   } else {
     function->OnQuotaExceeded(violation_error);
   }
 
   // Note: do not access |this| after this point. We may have been deleted
@@ skipping 132 matching lines @@
 
 // static
 void ExtensionFunctionDispatcher::SendAccessDenied(
     const ExtensionFunction::ResponseCallback& callback) {
   base::ListValue empty_list;
   callback.Run(ExtensionFunction::FAILED, empty_list,
                "Access to extension API denied.");
 }
 
 }  // namespace extensions