'Paste' & 'Paste as plain text' should check edit_flags.

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 1180 matching lines @@
     case IDC_CONTENT_CONTEXT_REDO:
       return !!(params_.edit_flags & WebContextMenuData::CanRedo);
 
     case IDC_CONTENT_CONTEXT_CUT:
       return !!(params_.edit_flags & WebContextMenuData::CanCut);
 
     case IDC_CONTENT_CONTEXT_COPY:
       return !!(params_.edit_flags & WebContextMenuData::CanCopy);
 
     case IDC_CONTENT_CONTEXT_PASTE: {
+      if (!(params_.edit_flags & WebContextMenuData::CanPaste))
+        return false;
+
       std::vector<base::string16> types;
       bool ignore;
       ui::Clipboard::GetForCurrentThread()->ReadAvailableTypes(
           ui::CLIPBOARD_TYPE_COPY_PASTE, &types, &ignore);
       return !types.empty();
     }
 
     case IDC_CONTENT_CONTEXT_PASTE_AND_MATCH_STYLE: {
+      if (!(params_.edit_flags & WebContextMenuData::CanPaste))
+        return false;
+
       return ui::Clipboard::GetForCurrentThread()->IsFormatAvailable(
           ui::Clipboard::GetPlainTextFormatType(),
           ui::CLIPBOARD_TYPE_COPY_PASTE);
     }
 
     case IDC_CONTENT_CONTEXT_DELETE:
       return !!(params_.edit_flags & WebContextMenuData::CanDelete);
 
     case IDC_CONTENT_CONTEXT_SELECTALL:
       return !!(params_.edit_flags & WebContextMenuData::CanSelectAll);
@@ skipping 557 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);
 }