Add a chrome://interstitials page.

chrome/browser/ssl/ssl_blocking_page.cc

Index: chrome/browser/ssl/ssl_blocking_page.cc
diff --git a/chrome/browser/ssl/ssl_blocking_page.cc b/chrome/browser/ssl/ssl_blocking_page.cc
index d0d95b8f5e744a3b3f0981549be09553bfe39b42..2d594d8c8872d182cb5522b8c828b3d3f8f19404 100644
--- a/chrome/browser/ssl/ssl_blocking_page.cc
+++ b/chrome/browser/ssl/ssl_blocking_page.cc
@@ -260,6 +260,7 @@ bool IsErrorProbablyCausedByClock(bool overridable, int cert_info) {
 // No error happening loading a sub-resource triggers an interstitial so far.
 SSLBlockingPage::SSLBlockingPage(
     content::WebContents* web_contents,
+    bool create_interstitial,
     int cert_error,
     const net::SSLInfo& ssl_info,
     const GURL& request_url,
@@ -311,9 +312,11 @@ SSLBlockingPage::SSLBlockingPage(
                  content::Source<Profile>(profile));
 #endif
 
-  interstitial_page_ = InterstitialPage::Create(
-      web_contents_, true, request_url, this);
-  interstitial_page_->Show();
+  if (create_interstitial) {

[felt, 2014/07/15 01:35:07]

This makes me a little nervous -- can you add a comment here to make sure
someone else doesn't come along and screw up the conditional?

[meacer, 2014/07/15 19:48:06]

Done.

+    interstitial_page_ = InterstitialPage::Create(
+        web_contents_, true, request_url, this);
+    interstitial_page_->Show();
+  }
 }
 
 SSLBlockingPage::~SSLBlockingPage() {