Use InterstitialPage through a delegate interface instead of deriving from it.

chrome/renderer/content_settings_observer.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 "chrome/renderer/content_settings_observer.h"
 
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/renderer/document_state.h"
 #include "content/public/renderer/navigation_state.h"
@@ skipping 84 matching lines @@
   }
 }
 
 bool ContentSettingsObserver::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ContentSettingsObserver, message)
     // Don't swallow LoadBlockedPlugins messages, as they're sent to every
     // blocked plugin.
     IPC_MESSAGE_HANDLER_GENERIC(ChromeViewMsg_LoadBlockedPlugins,
                                 OnLoadBlockedPlugins(); handled = false)
+    IPC_MESSAGE_HANDLER(ChromeViewMsg_SetAsInterstitial, OnSetAsInterstitial)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void ContentSettingsObserver::DidCommitProvisionalLoad(
     WebFrame* frame, bool is_new_navigation) {
   if (frame->parent())
     return; // Not a top-level navigation.
 
@@ skipping 158 matching lines @@
 }
 
 void ContentSettingsObserver::DidNotAllowPlugins(WebFrame* frame) {
   DidBlockContentType(CONTENT_SETTINGS_TYPE_PLUGINS, std::string());
 }
 
 void ContentSettingsObserver::DidNotAllowScript(WebFrame* frame) {
   DidBlockContentType(CONTENT_SETTINGS_TYPE_JAVASCRIPT, std::string());
 }
 
-void ContentSettingsObserver::SetAsInterstitial() {
-  is_interstitial_page_ = true;
-}
-
 void ContentSettingsObserver::OnLoadBlockedPlugins() {
   plugins_temporarily_allowed_ = true;
 }
 
+void ContentSettingsObserver::OnSetAsInterstitial() {
+  is_interstitial_page_ = true;
+}
+
 void ContentSettingsObserver::ClearBlockedContentSettings() {
   for (size_t i = 0; i < arraysize(content_blocked_); ++i)
     content_blocked_[i] = false;
   cached_storage_permissions_.clear();
   cached_script_permissions_.clear();
 }
 
 bool ContentSettingsObserver::IsWhitelistedForContentSettings(WebFrame* frame) {
   return IsWhitelistedForContentSettings(frame->document().securityOrigin(),
                                          frame->document().url());
@@ skipping 22 matching lines @@
   const char* kDirProtocols[] = { chrome::kFtpScheme, chrome::kFileScheme };
   for (size_t i = 0; i < arraysize(kDirProtocols); ++i) {
     if (EqualsASCII(origin.protocol(), kDirProtocols[i])) {
       return document_url.SchemeIs(kDirProtocols[i]) &&
              document_url.ExtractFileName().empty();
     }
   }
 
   return false;
 }