Introduce default implementation for TabContentsDelegate::ViewSourceForTab.

chrome/browser/ui/browser.cc

 // Copyright (c) 2010 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/ui/browser.h"
 
 #if defined(OS_WIN)
 #include <shellapi.h>
 #include <windows.h>
 #endif  // OS_WIN
@@ skipping 3033 matching lines @@
   window()->ConfirmAddSearchProvider(template_url, profile);
 }
 
 void Browser::ShowPageInfo(Profile* profile,
                            const GURL& url,
                            const NavigationEntry::SSLStatus& ssl,
                            bool show_history) {
   window()->ShowPageInfo(profile, url, ssl, show_history);
 }
 
-void Browser::ViewSourceForTab(TabContents* contents) {
-  DCHECK(contents);
-  int index = tabstrip_model()->GetWrapperIndex(contents);
+void Browser::ViewSourceForTab(TabContents* source, const GURL& page_url) {
+  DCHECK(source);
+  int index = tabstrip_model()->GetWrapperIndex(source);
   TabContentsWrapper* wrapper = tabstrip_model()->GetTabContentsAt(index);
   ViewSource(wrapper);
 }
 
 bool Browser::PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                                      bool* is_keyboard_shortcut) {
   return window()->PreHandleKeyboardEvent(event, is_keyboard_shortcut);
 }
 
 void Browser::HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {
@@ skipping 1059 matching lines @@
 }
 
 void Browser::ViewSource(TabContentsWrapper* contents) {
   UserMetrics::RecordAction(UserMetricsAction("ViewSource"), profile_);
   DCHECK(contents);
 
   TabContentsWrapper* view_source_contents = contents->Clone();
   view_source_contents->controller().PruneAllButActive();
   NavigationEntry* active_entry =
       view_source_contents->controller().GetActiveEntry();
+  if (!active_entry)
+    return;
+
   GURL url = GURL(chrome::kViewSourceScheme + std::string(":") +
       active_entry->url().spec());
   active_entry->set_virtual_url(url);
   InsertContentsDupe(contents, view_source_contents);
 }
 
 void Browser::InsertContentsDupe(
     TabContentsWrapper* contents,
     TabContentsWrapper* contents_dupe) {
   DCHECK(contents);
@@ skipping 37 matching lines @@
     // The page transition below is only for the purpose of inserting the tab.
     browser->AddTab(contents_dupe, PageTransition::LINK);
   }
 
   if (profile_->HasSessionService()) {
     SessionService* session_service = profile_->GetSessionService();
     if (session_service)
       session_service->TabRestored(&new_contents->controller(), pinned);
   }
 }