Introduce default implementation for TabContentsDelegate::ViewSourceForTab.

chrome/browser/tab_contents/tab_contents_delegate.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/tab_contents/tab_contents_delegate.h"
 
 #include "chrome/browser/search_engines/template_url.h"
+#include "chrome/common/url_constants.h"
 #include "gfx/rect.h"
 
 std::string TabContentsDelegate::GetNavigationHeaders(const GURL& url) {
   return std::string();
 }
 
 void TabContentsDelegate::DetachContents(TabContents* source) {
 }
 
 bool TabContentsDelegate::IsPopup(const TabContents* source) const {
@@ skipping 106 matching lines @@
     Profile* profile) {
   delete template_url;
 }
 
 void TabContentsDelegate::ShowPageInfo(Profile* profile,
                                        const GURL& url,
                                        const NavigationEntry::SSLStatus& ssl,
                                        bool show_history) {
 }
 
-void TabContentsDelegate::ViewSourceForTab(TabContents* source) {
+void TabContentsDelegate::ViewSourceForTab(TabContents* source,
+                                           const GURL& page_url) {
+  // Fall back implementation based entirely on the view-source scheme.
+  // It suffers from http://crbug.com/523 and that is why browser overrides
+  // it with proper implementation.
+  GURL url = GURL(chrome::kViewSourceScheme + std::string(":") +
+                      page_url.spec());
+  OpenURLFromTab(source,
+                 url,
+                 GURL(),
+                 NEW_FOREGROUND_TAB,
+                 PageTransition::LINK);
 }
 
 bool TabContentsDelegate::PreHandleKeyboardEvent(
     const NativeWebKeyboardEvent& event,
     bool* is_keyboard_shortcut) {
   return false;
 }
 
 void TabContentsDelegate::HandleKeyboardEvent(
     const NativeWebKeyboardEvent& event) {
@@ skipping 62 matching lines @@
 
 void TabContentsDelegate::OnInstantSupportDetermined(int32 page_id,
                                                      bool result) {
 }
 
 void TabContentsDelegate::ContentRestrictionsChanged(TabContents* source) {
 }
 
 TabContentsDelegate::~TabContentsDelegate() {
 }