Make TabContents own its infobar delegates....

chrome/browser/gtk/translate/before_translate_infobar_gtk.cc

Index: chrome/browser/gtk/translate/before_translate_infobar_gtk.cc
===================================================================
--- chrome/browser/gtk/translate/before_translate_infobar_gtk.cc	(revision 65711)
+++ chrome/browser/gtk/translate/before_translate_infobar_gtk.cc	(working copy)
@@ -31,9 +31,10 @@
   gtk_box_pack_start(GTK_BOX(hbox),
                      CreateLabel(UTF16ToUTF8(text.substr(0, offset))),
                      FALSE, FALSE, 0);
+  TranslateInfoBarDelegate* delegate = GetDelegate();
   GtkWidget* combobox =
-      CreateLanguageCombobox(GetDelegate()->original_language_index(),
-                             GetDelegate()->target_language_index());
+      CreateLanguageCombobox(delegate->original_language_index(),
+                             delegate->target_language_index());
   g_signal_connect(combobox, "changed",
                    G_CALLBACK(&OnLanguageModifiedThunk), this);
   gtk_box_pack_start(GTK_BOX(hbox), combobox, FALSE, FALSE, 0);
@@ -51,7 +52,6 @@
   g_signal_connect(button, "clicked",G_CALLBACK(&OnDenyPressedThunk), this);
   gtk_box_pack_start(GTK_BOX(hbox), button, FALSE, FALSE, 0);
 
-  TranslateInfoBarDelegate* delegate = GetDelegate();
   if (delegate->ShouldShowNeverTranslateButton()) {
     std::string label =
         l10n_util::GetStringFUTF8(IDS_TRANSLATE_INFOBAR_NEVER_TRANSLATE,
@@ -76,6 +76,9 @@
 }
 
 void BeforeTranslateInfoBar::OnLanguageModified(GtkWidget* sender) {
+  if (!delegate())
+    return;
+
   int index = GetLanguageComboboxActiveId(GTK_COMBO_BOX(sender));
   if (index == GetDelegate()->original_language_index())
     return;
@@ -84,18 +87,22 @@
 }
 
 void BeforeTranslateInfoBar::OnAcceptPressed(GtkWidget* sender) {
-  GetDelegate()->Translate();
+  if (delegate())
+    GetDelegate()->Translate();
 }
 
 void BeforeTranslateInfoBar::OnDenyPressed(GtkWidget* sender) {
-  GetDelegate()->TranslationDeclined();
+  if (delegate())
+    GetDelegate()->TranslationDeclined();
   RemoveInfoBar();
 }
 
 void BeforeTranslateInfoBar::OnNeverTranslatePressed(GtkWidget* sender) {
-  GetDelegate()->NeverTranslatePageLanguage();
+  if (delegate())
+    GetDelegate()->NeverTranslatePageLanguage();
 }
 
 void BeforeTranslateInfoBar::OnAlwaysTranslatePressed(GtkWidget* sender) {
-  GetDelegate()->AlwaysTranslatePageLanguage();
+  if (delegate())
+    GetDelegate()->AlwaysTranslatePageLanguage();
 }