Fix browser crash when viewing page info on certain popups.

chrome/browser/tab_contents/render_view_context_menu.cc

 // Copyright (c) 2011 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 <algorithm>
 #include <set>
 
 #include "chrome/browser/tab_contents/render_view_context_menu.h"
 
 #include "base/command_line.h"
@@ skipping 1026 matching lines @@
     case IDC_RELOAD:
       return source_tab_contents_->delegate() &&
           source_tab_contents_->delegate()->CanReloadContents(
               source_tab_contents_);
 
     case IDC_VIEW_SOURCE:
     case IDC_CONTENT_CONTEXT_VIEWFRAMESOURCE:
       return source_tab_contents_->controller().CanViewSource();
 
     case IDC_CONTENT_CONTEXT_INSPECTELEMENT:
-    // Viewing page info is not a developer command but is meaningful for the
-    // same set of pages which developer commands are meaningful for.
+      return IsDevCommandEnabled(id);
+
     case IDC_CONTENT_CONTEXT_VIEWPAGEINFO:
-      return IsDevCommandEnabled(id);
+      return source_tab_contents_->controller().GetActiveEntry() != NULL;
 
     case IDC_CONTENT_CONTEXT_TRANSLATE: {
       TabContentsWrapper* tab_contents_wrapper =
           TabContentsWrapper::GetCurrentWrapperForContents(
               source_tab_contents_);
       if (!tab_contents_wrapper)
         return false;
       TranslateTabHelper* helper = tab_contents_wrapper->translate_tab_helper();
       std::string original_lang =
           helper->language_state().original_language();
@@ skipping 800 matching lines @@
       profile_->GetPrefs()->GetString(prefs::kAcceptLanguages),
       g_browser_process->clipboard());
 }
 
 void RenderViewContextMenu::MediaPlayerActionAt(
     const gfx::Point& location,
     const WebMediaPlayerAction& action) {
   source_tab_contents_->render_view_host()->
       ExecuteMediaPlayerActionAtLocation(location, action);
 }