Show interstitial from ManagedModeNavigationObserver instead of ManagedModeResourceThrottle.

chrome/browser/managed_mode/managed_mode_resource_throttle.cc

Index: chrome/browser/managed_mode/managed_mode_resource_throttle.cc
diff --git a/chrome/browser/managed_mode/managed_mode_resource_throttle.cc b/chrome/browser/managed_mode/managed_mode_resource_throttle.cc
index 654dca87238706fd85cb246e2bcd03e2ce67ea5b..c5fe6e1cc289f3d970006e1e2a8b8cdd57d8e0b7 100644
--- a/chrome/browser/managed_mode/managed_mode_resource_throttle.cc
+++ b/chrome/browser/managed_mode/managed_mode_resource_throttle.cc
@@ -5,12 +5,16 @@
 #include "chrome/browser/managed_mode/managed_mode_resource_throttle.h"
 
 #include "base/lazy_instance.h"
+#include "base/location.h"
 #include "chrome/browser/managed_mode/managed_mode.h"
-#include "chrome/browser/managed_mode/managed_mode_interstitial.h"
+#include "chrome/browser/managed_mode/managed_mode_navigation_observer.h"
 #include "chrome/browser/managed_mode/managed_mode_url_filter.h"
+#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/resource_controller.h"
 #include "net/url_request/url_request.h"
 
+using content::BrowserThread;
+
 namespace {
 
 // Uniquely identifies a tab, used to set a temporary exception on it.
@@ -44,7 +48,7 @@ struct TemporaryExceptionData {
 typedef std::map<WebContentsId, TemporaryExceptionData> PreviewMap;
 base::LazyInstance<PreviewMap> g_in_preview_mode = LAZY_INSTANCE_INITIALIZER;
 
-}
+}  // namespace
 
 ManagedModeResourceThrottle::ManagedModeResourceThrottle(
     const net::URLRequest* request,
@@ -127,10 +131,13 @@ void ManagedModeResourceThrottle::ShowInterstitialIfNeeded(bool is_redirect,
   }
 
   *defer = true;
-  ManagedModeInterstitial::ShowInterstitial(
-      render_process_host_id_, render_view_id_, url,
-      base::Bind(&ManagedModeResourceThrottle::OnInterstitialResult,
-                 weak_ptr_factory_.GetWeakPtr()));
+
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(&ManagedModeNavigationObserver::DidBlockRequest,
+                 render_process_host_id_, render_view_id_, url,
+                 base::Bind(&ManagedModeResourceThrottle::OnInterstitialResult,
+                            weak_ptr_factory_.GetWeakPtr())));
 }
 
 void ManagedModeResourceThrottle::WillStartRequest(bool* defer) {