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

chrome/browser/ui/pdf/pdf_unsupported_feature.cc

Index: chrome/browser/ui/pdf/pdf_unsupported_feature.cc
===================================================================
--- chrome/browser/ui/pdf/pdf_unsupported_feature.cc	(revision 120576)
+++ chrome/browser/ui/pdf/pdf_unsupported_feature.cc	(working copy)
@@ -13,7 +13,7 @@
 #include "chrome/browser/plugin_prefs.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/tab_contents/chrome_interstitial_page.h"
+#include "chrome/browser/renderer_preferences_util.h"
 #include "chrome/browser/tab_contents/confirm_infobar_delegate.h"
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
@@ -21,6 +21,8 @@
 #include "chrome/common/jstemplate_builder.h"
 #include "chrome/common/pref_names.h"
 #include "content/browser/renderer_host/render_view_host.h"
+#include "content/browser/tab_contents/interstitial_page.h"
+#include "content/public/browser/interstitial_page_delegate.h"
 #include "content/public/browser/plugin_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/user_metrics.h"
@@ -162,21 +164,23 @@
 
 // An interstitial to be used when the user chooses to open a PDF using Adobe
 // Reader, but it is out of date.
-class PDFUnsupportedFeatureInterstitial : public ChromeInterstitialPage {
+class PDFUnsupportedFeatureInterstitial
+    : public content::InterstitialPageDelegate {
  public:
   PDFUnsupportedFeatureInterstitial(
       TabContentsWrapper* tab,
       const WebPluginInfo& reader_webplugininfo)
-      : ChromeInterstitialPage(
-            tab->web_contents(), false, tab->web_contents()->GetURL()),
-        tab_contents_(tab),
+      : tab_contents_(tab),
         reader_webplugininfo_(reader_webplugininfo) {
     content::RecordAction(UserMetricsAction("PDF_ReaderInterstitialShown"));
+    interstitial_page_ = InterstitialPage::Create(
+        tab->web_contents(), false, tab->web_contents()->GetURL(), this);
+    interstitial_page_->Show();
   }
 
  protected:
-  // ChromeInterstitialPage implementation.
-  virtual std::string GetHTMLContents() {
+  // InterstitialPageDelegate implementation.
+  virtual std::string GetHTMLContents() OVERRIDE {
     DictionaryValue strings;
     strings.SetString(
         "title",
@@ -204,18 +208,18 @@
     return jstemplate_builder::GetI18nTemplateHtml(html, &strings);
   }
 
-  virtual void CommandReceived(const std::string& command) {
+  virtual void CommandReceived(const std::string& command) OVERRIDE {
     if (command == "0") {
       content::RecordAction(
           UserMetricsAction("PDF_ReaderInterstitialCancel"));
-      DontProceed();
+      interstitial_page_->DontProceed();
       return;
     }
 
     if (command == "1") {
       content::RecordAction(
           UserMetricsAction("PDF_ReaderInterstitialUpdate"));
-      OpenReaderUpdateURL(tab());
+      OpenReaderUpdateURL(tab_contents_->web_contents());
     } else if (command == "2") {
       content::RecordAction(
           UserMetricsAction("PDF_ReaderInterstitialIgnore"));
@@ -223,12 +227,19 @@
     } else {
       NOTREACHED();
     }
-    Proceed();
+    interstitial_page_->Proceed();
   }
 
+  virtual void OverrideRendererPrefs(
+      content::RendererPreferences* prefs) OVERRIDE {
+    renderer_preferences_util::UpdateFromSystemSettings(
+        prefs, tab_contents_->profile());
+  }
+
  private:
   TabContentsWrapper* tab_contents_;
   WebPluginInfo reader_webplugininfo_;
+  InterstitialPage* interstitial_page_;  // Owns us.
 
   DISALLOW_COPY_AND_ASSIGN(PDFUnsupportedFeatureInterstitial);
 };
@@ -341,10 +352,7 @@
   content::RecordAction(UserMetricsAction("PDF_UseReaderInfoBarOK"));
 
   if (reader_vulnerable_) {
-    PDFUnsupportedFeatureInterstitial* interstitial =
-        new PDFUnsupportedFeatureInterstitial(tab_contents_,
-                                              reader_webplugininfo_);
-    interstitial->Show();
+    new PDFUnsupportedFeatureInterstitial(tab_contents_, reader_webplugininfo_);
     return true;
   }