Added code to disable 'paste' if nothing is present in clipboard to paste.

chrome/browser/renderer_context_menu/render_view_context_menu.cc

Index: chrome/browser/renderer_context_menu/render_view_context_menu.cc
diff --git a/chrome/browser/renderer_context_menu/render_view_context_menu.cc b/chrome/browser/renderer_context_menu/render_view_context_menu.cc
index 8b1f54547a36a5301418e68b6e521c204cc1aece..77dea72d2e1d2677d383041438e8a3388967cdb5 100644
--- a/chrome/browser/renderer_context_menu/render_view_context_menu.cc
+++ b/chrome/browser/renderer_context_menu/render_view_context_menu.cc
@@ -1364,9 +1364,14 @@ bool RenderViewContextMenu::IsCommandIdEnabled(int id) const {
       return !!(params_.edit_flags & WebContextMenuData::CanCopy);
 
     case IDC_CONTENT_CONTEXT_PASTE:
-    case IDC_CONTENT_CONTEXT_PASTE_AND_MATCH_STYLE:
-      return !!(params_.edit_flags & WebContextMenuData::CanPaste);
-
+    case IDC_CONTENT_CONTEXT_PASTE_AND_MATCH_STYLE: {
+      // Disabled if clipboard has no data.
+      std::vector<base::string16> types;
+      bool ignore;
+      ui::Clipboard::GetForCurrentThread()->ReadAvailableTypes(
+          ui::CLIPBOARD_TYPE_COPY_PASTE, &types, &ignore);
+      return types.size() > 0;

[groby-ooo-7-16, 2014/08/05 17:58:55]

nit: !types.empty(), please

+    }
     case IDC_CONTENT_CONTEXT_DELETE:
       return !!(params_.edit_flags & WebContextMenuData::CanDelete);