(Reland) Remove about:srcdoc url conversion.

content/browser/frame_host/navigation_entry_impl.cc

 // Copyright 2013 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 "content/browser/frame_host/navigation_entry_impl.h"
 
 #include <stddef.h>
 
 #include <queue>
 #include <utility>
@@ skipping 858 matching lines @@
   std::map<std::string, bool> names;
   NavigationEntryImpl::TreeNode* tree_node = FindFrameEntry(frame_tree_node);
   if (tree_node) {
     // Return the names of all immediate children.
     for (TreeNode* child : tree_node->children) {
       // Keep track of whether we would be loading about:blank, since the
       // renderer should be allowed to just commit the initial blank frame if
       // that was the default URL.  PageState doesn't matter there, because
       // content injected into about:blank frames doesn't use it.
       //
-      // Be careful not to include iframe srcdoc URLs in this check, which do
-      // need their PageState.  The committed URL in that case gets rewritten to
-      // about:blank, but we can detect it via the PageState's URL.
-      //
+      // Be careful not to rely on FrameNavigationEntry's URLs in this check,
+      // because the committed URL in the browser could be rewritten to
+      // about:blank.
+      // See RenderProcessHostImpl::FilterURL to know which URLs are rewritten.
       // See https://crbug.com/657896 for details.
       bool is_about_blank = false;
       ExplodedPageState exploded_page_state;
       if (DecodePageState(child->frame_entry->page_state().ToEncodedData(),
                           &exploded_page_state)) {
         ExplodedFrameState frame_state = exploded_page_state.top;
         if (UTF16ToUTF8(frame_state.url_string.string()) == url::kAboutBlankURL)
           is_about_blank = true;
       }
 
@@ skipping 63 matching lines @@
       return node;
 
     // Enqueue any children and keep looking.
     for (auto* child : node->children)
       work_queue.push(child);
   }
   return nullptr;
 }
 
 }  // namespace content