Remove about:srcdoc url conversion.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index c8cbea2370ade26c37a59d63bc45b09ecf01a971..483f7ada6b38b9d2a489790b067d1bb3b46fd6f4 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -2354,12 +2354,6 @@ void RenderProcessHostImpl::FilterURL(RenderProcessHost* rph,
     return;
   }
 
-  if (url->SchemeIs(url::kAboutScheme)) {
-    // The renderer treats all URLs in the about: scheme as being about:blank.
-    // Canonicalize about: URLs to about:blank.
-    *url = GURL(url::kAboutBlankURL);
-  }
-
   if (!policy->CanRequestURL(rph->GetID(), *url)) {
     // If this renderer is not permitted to request this URL, we invalidate the
     // URL.  This prevents us from storing the blocked URL and becoming confused