Implement unregisterProtocolHandler()

chrome/browser/ui/browser.cc

 // Copyright 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/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // defined(OS_WIN)
@@ skipping 1646 matching lines @@
   if (PermissionBubbleManager::Enabled() && bubble_manager) {
     bubble_manager->AddRequest(
         new RegisterProtocolHandlerPermissionRequest(registry, handler,
                                                      url, user_gesture));
   } else {
     RegisterProtocolHandlerInfoBarDelegate::Create(
         InfoBarService::FromWebContents(web_contents), registry, handler);
   }
 }
 
+void Browser::UnregisterProtocolHandler(WebContents* web_contents,
+                                        const std::string& protocol,
+                                        const GURL& url,
+                                        bool user_gesture) {

[kenrb, 2014/07/11 14:38:37]

This appears to be an unused argument passed from the renderer process. Is this
going to be used in future or can it be removed?

+  Profile* profile =
+      Profile::FromBrowserContext(web_contents->GetBrowserContext());
+  if (profile->IsOffTheRecord())
+    return;
+
+  ProtocolHandler handler =
+      ProtocolHandler::CreateProtocolHandler(protocol, url);
+
+  ProtocolHandlerRegistry* registry =
+      ProtocolHandlerRegistryFactory::GetForProfile(profile);
+  registry->RemoveHandler(handler);
+}
+
 void Browser::UpdatePreferredSize(WebContents* source,
                                   const gfx::Size& pref_size) {
   window_->UpdatePreferredSize(source, pref_size);
 }
 
 void Browser::ResizeDueToAutoResize(WebContents* source,
                                     const gfx::Size& new_size) {
   window_->ResizeDueToAutoResize(source, new_size);
 }
 
@@ skipping 743 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         content::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }