[Media Router] Adds a contextual menu item to remove the MR component action.

chrome/browser/extensions/component_migration_helper.cc

 // Copyright 2016 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/extensions/component_migration_helper.h"
 
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/stl_util.h"
@@ skipping 95 matching lines @@
   DCHECK(!extension_ids.empty());
 
   enabled_actions_.erase(component_action_id);
   RemoveComponentActionPref(component_action_id);
 
   if (FeatureSwitch::extension_action_redesign()->IsEnabled() &&
       delegate_->HasComponentAction(component_action_id))
     delegate_->RemoveComponentAction(component_action_id);
 }
 
+void ComponentMigrationHelper::OnActionRemoved(
+    const std::string& component_action_id) {
+  // Record preference for the future.
+  SetComponentActionPref(component_action_id, false);
+
+  // Remove the action.
+  if (delegate_->HasComponentAction(component_action_id))
+    delegate_->RemoveComponentAction(component_action_id);
+}
+
 void ComponentMigrationHelper::OnExtensionReady(
     content::BrowserContext* browser_context,
     const Extension* extension) {
   const ExtensionId& extension_id = extension->id();
   const std::string& component_action_id =
       GetActionIdForExtensionId(extension_id);
   if (component_action_id.empty())
     return;
   if (ContainsKey(enabled_actions_, component_action_id)) {
     UnloadExtension(extension_id);
@@ skipping 44 matching lines @@
 std::string ComponentMigrationHelper::GetActionIdForExtensionId(
     const ExtensionId& extension_id) const {
   for (const auto& i : migrated_actions_) {
     if (i.second == extension_id)
       return i.first;
   }
   return "";
 }
 
 }  // namespace extensions