Block redirects to renderer-debug urls.

chrome/browser/captive_portal/captive_portal_tab_helper.cc

Index: chrome/browser/captive_portal/captive_portal_tab_helper.cc
diff --git a/chrome/browser/captive_portal/captive_portal_tab_helper.cc b/chrome/browser/captive_portal/captive_portal_tab_helper.cc
index 647cc62728950da07115f606adf4d32132fabf0a..6f7262577d867759b5a3c91fb355ff99737231dd 100644
--- a/chrome/browser/captive_portal/captive_portal_tab_helper.cc
+++ b/chrome/browser/captive_portal/captive_portal_tab_helper.cc
@@ -63,8 +63,8 @@ void CaptivePortalTabHelper::DidStartNavigation(
     return;
   }
 
-  // TODO(clamy): Remove this when we understand the root cause behind
-  // crbug.com/704892.
+  // TODO(clamy): The root cause behind crbug.com/704892 is known.
+  // Remove this code if it is never reached until ~ 2017-July-20.
   if (navigation_handle == navigation_handle_)
     base::debug::DumpWithoutCrashing();
 
@@ -96,11 +96,6 @@ void CaptivePortalTabHelper::DidFinishNavigation(
     content::NavigationHandle* navigation_handle) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
-  // TODO(clamy): Remove this when we understand the root cause behind
-  // crbug.com/704892.
-  if (navigation_handle_ && !navigation_handle_->IsInMainFrame())
-    base::debug::DumpWithoutCrashing();
-
   // Exclude subframe navigations.
   if (!navigation_handle->IsInMainFrame())
     return;