Correct histogram enum id for IDC_CONTENT_CONTEXT_SAVEAVAS in context menu.

chrome/browser/renderer_context_menu/render_view_context_menu.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/render_view_context_menu.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 
@@ skipping 165 matching lines @@
     /*
       enum id for 0, 1 are detected using
       RenderViewContextMenu::IsContentCustomCommandId and
       ContextMenuMatcher::IsExtensionsCustomCommandId
     */
     {2, -1, IDC_CONTENT_CONTEXT_PROTOCOL_HANDLER_FIRST},
     {3, 0, IDC_CONTENT_CONTEXT_OPENLINKNEWTAB},
     {4, 15, IDC_CONTENT_CONTEXT_OPENLINKNEWWINDOW},
     {5, 1, IDC_CONTENT_CONTEXT_OPENLINKOFFTHERECORD},
     {6, 5, IDC_CONTENT_CONTEXT_SAVELINKAS},
-    {7, 17, IDC_CONTENT_CONTEXT_SAVEAVAS},
+    {7, 18, IDC_CONTENT_CONTEXT_SAVEAVAS},
     {8, 6, IDC_CONTENT_CONTEXT_SAVEIMAGEAS},
     {9, 2, IDC_CONTENT_CONTEXT_COPYLINKLOCATION},
     {10, 10, IDC_CONTENT_CONTEXT_COPYIMAGELOCATION},
     {11, -1, IDC_CONTENT_CONTEXT_COPYAVLOCATION},
     {12, 9, IDC_CONTENT_CONTEXT_COPYIMAGE},
     {13, 8, IDC_CONTENT_CONTEXT_OPENIMAGENEWTAB},
     {14, -1, IDC_CONTENT_CONTEXT_OPENAVNEWTAB},
     {15, -1, IDC_CONTENT_CONTEXT_PLAYPAUSE},
     {16, -1, IDC_CONTENT_CONTEXT_MUTE},
     {17, -1, IDC_CONTENT_CONTEXT_LOOP},
@@ skipping 1780 matching lines @@
   source_web_contents_->GetRenderViewHost()->
       ExecuteMediaPlayerActionAtLocation(location, action);
 }
 
 void RenderViewContextMenu::PluginActionAt(
     const gfx::Point& location,
     const WebPluginAction& action) {
   source_web_contents_->GetRenderViewHost()->
       ExecutePluginActionAtLocation(location, action);
 }