<webview>: Do not show blocked_by_client error page for guest.

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index 3705adc6d8c36ea7f2de5df27a45c55c55ec67e5..499130a40a3be40677396011260f82ce81cd0d8e 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -506,6 +506,8 @@ void BrowserPluginGuest::Initialize(
   // Navigation is disabled in Chrome Apps. We want to make sure guest-initiated
   // navigations still continue to function inside the app.
   renderer_prefs->browser_handles_all_top_level_requests = false;
+  // Disable "client blocked" error page for browser plugin.
+  renderer_prefs->disable_client_blocked_error_page = true;
 
   // Listen to embedder visibility changes so that the guest is in a 'shown'
   // state if both the embedder is visible and the BrowserPlugin is marked as