Fix "unreachable code" warnings (MSVC warning 4702) in chrome/browser/.

chrome/browser/renderer_context_menu/context_menu_content_type_panel.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 "chrome/browser/renderer_context_menu/context_menu_content_type_panel.h"
 
 ContextMenuContentTypePanel::ContextMenuContentTypePanel(
     content::RenderFrameHost* render_frame_host,
     const content::ContextMenuParams& params)
     : ContextMenuContentType(render_frame_host, params, false) {
 }
 
 ContextMenuContentTypePanel::~ContextMenuContentTypePanel() {
 }
 
 bool ContextMenuContentTypePanel::SupportsGroup(int group) {
   switch (group) {
     case ITEM_GROUP_LINK:
       // Checking link should take precedence before checking selection since on
       // Mac right-clicking a link will also make it selected.
-      return params_.unfiltered_link_url.is_valid();
+      return params().unfiltered_link_url.is_valid();
     case ITEM_GROUP_EDITABLE:
     case ITEM_GROUP_COPY:
       return ContextMenuContentType::SupportsGroup(group);
     case ITEM_GROUP_CURRENT_EXTENSION:
       return true;
     default:
       return false;
   }
 }