Block renderer-initiated main frame navigations to data URLs

chrome/browser/tab_contents/navigation_metrics_recorder.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/tab_contents/navigation_metrics_recorder.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "components/navigation_metrics/navigation_metrics.h"
@@ skipping 70 matching lines @@
   navigation_metrics::RecordMainFrameNavigation(
       last_committed_entry->GetVirtualURL(),
       navigation_handle->IsSameDocument(), context->IsOffTheRecord());
 
   // Record the domain and registry of the URL that resulted in a navigation to
   // a |data:| URL, either by redirects or user clicking a link.
   if (last_committed_entry->GetVirtualURL().SchemeIs(url::kDataScheme) &&
       !ui::PageTransitionCoreTypeIs(navigation_handle->GetPageTransition(),
                                     ui::PAGE_TRANSITION_TYPED)) {
     if (!navigation_handle->GetPreviousURL().is_empty()) {
+      // TODO(meacer): Remove once data URL navigations are blocked.
       rappor::SampleDomainAndRegistryFromGURL(
           rappor_service_, "Navigation.Scheme.Data",
           navigation_handle->GetPreviousURL());
     }
 
     // Also record the mime type of the data: URL.
     std::string mime_type;
     std::string charset;
+    // TODO(meacer): Remove once data URL navigations are blocked.
     if (net::DataURL::Parse(last_committed_entry->GetVirtualURL(), &mime_type,
                             &charset, nullptr)) {
       RecordDataURLMimeType(mime_type);
     }
   }
 }