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

chrome/renderer/chrome_render_view_observer.cc

 // Copyright (c) 2012 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/chrome_render_view_observer.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 245 matching lines @@
     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetClientSidePhishingDetection,
                         OnSetClientSidePhishingDetection)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetVisuallyDeemphasized,
                         OnSetVisuallyDeemphasized)
 #if defined(OS_CHROMEOS)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_StartFrameSniffer, OnStartFrameSniffer)
 #endif
     IPC_MESSAGE_HANDLER(ChromeViewMsg_GetFPS, OnGetFPS)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_AddStrictSecurityHost,
                         OnAddStrictSecurityHost)
-    IPC_MESSAGE_HANDLER(ChromeViewMsg_SetAsInterstitial, OnSetAsInterstitial)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   // Filter only.
   IPC_BEGIN_MESSAGE_MAP(ChromeRenderViewObserver, message)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetIsPrerendering, OnSetIsPrerendering);
   IPC_END_MESSAGE_MAP()
 
   return handled;
 }
@@ skipping 77 matching lines @@
 void ChromeRenderViewObserver::OnSetAllowRunningInsecureContent(bool allow) {
   allow_running_insecure_content_ = allow;
   OnSetAllowDisplayingInsecureContent(allow);
 }
 
 void ChromeRenderViewObserver::OnAddStrictSecurityHost(
     const std::string& host) {
   strict_security_hosts_.insert(host);
 }
 
-void ChromeRenderViewObserver::OnSetAsInterstitial() {
-  content_settings_->SetAsInterstitial();
-}
-
 void ChromeRenderViewObserver::Navigate(const GURL& url) {
   // Execute cache clear operations that were postponed until a navigation
   // event (including tab reload).
   if (chrome_render_process_observer_)
     chrome_render_process_observer_->ExecutePendingClearCache();
   AboutHandler::MaybeHandle(url);
 }
 
 void ChromeRenderViewObserver::OnSetClientSidePhishingDetection(
     bool enable_phishing_detection) {
@@ skipping 678 matching lines @@
         reinterpret_cast<const unsigned char*>(&data[0]);
 
     return decoder.Decode(src_data, data.size());
   }
   return SkBitmap();
 }
 
 bool ChromeRenderViewObserver::IsStrictSecurityHost(const std::string& host) {
   return (strict_security_hosts_.find(host) != strict_security_hosts_.end());
 }