Disable off-store extension installs by default.

chrome/browser/ui/intents/web_intent_picker_controller.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/intents/web_intent_picker_controller.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 289 matching lines @@
 }
 
 void WebIntentPickerController::OnInlineDispositionWebContentsCreated(
     content::WebContents* web_contents) {
   if (web_contents)
     intents_dispatcher_->DispatchIntent(web_contents);
 }
 
 void WebIntentPickerController::OnExtensionInstallRequested(
     const std::string& id) {
+  scoped_ptr<WebstoreInstaller::Approval> approval(
+      WebstoreInstaller::Approval::CreateWithInstallPrompt(
+          wrapper_->profile()));
+
   scoped_refptr<WebstoreInstaller> installer = new WebstoreInstaller(
       wrapper_->profile(), this, &wrapper_->web_contents()->GetController(), id,
-      scoped_ptr<WebstoreInstaller::Approval>(NULL),
-      WebstoreInstaller::FLAG_INLINE_INSTALL);
+      approval.Pass(), WebstoreInstaller::FLAG_INLINE_INSTALL);
 
   pending_async_count_++;
   installer->Start();
 }
 
 void WebIntentPickerController::OnExtensionLinkClicked(const std::string& id) {
   // Navigate from source tab.
   Browser* browser =
       BrowserList::FindBrowserWithWebContents(wrapper_->web_contents());
   GURL extension_url(extension_urls::GetWebstoreItemDetailURLPrefix() + id);
@@ skipping 360 matching lines @@
   // If picker is non-NULL, it was set by a test.
   if (picker_ == NULL)
     picker_ = WebIntentPicker::Create(wrapper_, this, picker_model_.get());
   picker_shown_ = true;
 }
 
 void WebIntentPickerController::ClosePicker() {
   if (picker_)
     picker_->Close();
 }