Respect command line flags for interstitial pages.

content/browser/tab_contents/interstitial_page.cc

Index: content/browser/tab_contents/interstitial_page.cc
diff --git a/content/browser/tab_contents/interstitial_page.cc b/content/browser/tab_contents/interstitial_page.cc
index e50ba126395e054a644a8e9a34d0cdbee2a4577d..778ef7716f05411ec0527870789a8912eb3bc3ec 100644
--- a/content/browser/tab_contents/interstitial_page.cc
+++ b/content/browser/tab_contents/interstitial_page.cc
@@ -393,6 +393,11 @@ content::RendererPreferences InterstitialPage::GetRendererPrefs(
   return renderer_preferences_;
 }
 
+WebPreferences InterstitialPage::GetWebkitPrefs() {
+  return content::GetContentClient()->browser()->GetWebkitPrefs(
+      render_view_host());
+}
+
 RenderViewHost* InterstitialPage::CreateRenderViewHost() {
   RenderViewHost* render_view_host = new RenderViewHost(
       SiteInstance::CreateSiteInstance(tab()->browser_context()),