Fix browser crash when viewing page info on certain popups.

chrome/browser/tab_contents/render_view_context_menu.cc

Index: chrome/browser/tab_contents/render_view_context_menu.cc
===================================================================
--- chrome/browser/tab_contents/render_view_context_menu.cc	(revision 109003)
+++ chrome/browser/tab_contents/render_view_context_menu.cc	(working copy)
@@ -1044,11 +1044,11 @@
       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.
-    case IDC_CONTENT_CONTEXT_VIEWPAGEINFO:
       return IsDevCommandEnabled(id);
 
+    case IDC_CONTENT_CONTEXT_VIEWPAGEINFO:
+      return source_tab_contents_->controller().GetActiveEntry() != NULL;
+
     case IDC_CONTENT_CONTEXT_TRANSLATE: {
       TabContentsWrapper* tab_contents_wrapper =
           TabContentsWrapper::GetCurrentWrapperForContents(