Remove about:srcdoc url conversion.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index a5550fff6a8af7bc3f4ee3887b3cabbd60724ca2..1091375b67c92c3ce152317260ef0edd72266913 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -3267,18 +3267,17 @@ void WebContentsImpl::DidFinishNavigation(NavigationHandle* navigation_handle) {
 void WebContentsImpl::DidStartProvisionalLoad(
     RenderFrameHostImpl* render_frame_host,
     const GURL& validated_url,
-    bool is_error_page,
-    bool is_iframe_srcdoc) {
+    bool is_error_page) {
   // Notify observers about the start of the provisional load.
   for (auto& observer : observers_) {
     observer.DidStartProvisionalLoadForFrame(render_frame_host, validated_url,
-                                             is_error_page, is_iframe_srcdoc);
+                                             is_error_page);
   }
 
   // Notify accessibility if this is a reload.
   NavigationEntry* entry = controller_.GetVisibleEntry();
-  if (entry && ui::PageTransitionCoreTypeIs(
-          entry->GetTransitionType(), ui::PAGE_TRANSITION_RELOAD)) {
+  if (entry && ui::PageTransitionCoreTypeIs(entry->GetTransitionType(),
+                                            ui::PAGE_TRANSITION_RELOAD)) {
     FrameTreeNode* ftn = render_frame_host->frame_tree_node();
     BrowserAccessibilityManager* manager =
         ftn->current_frame_host()->browser_accessibility_manager();
@@ -3549,7 +3548,8 @@ void WebContentsImpl::OnDidFinishLoad(const GURL& url) {
   GURL validated_url(url);
   RenderProcessHost* render_process_host =
       render_frame_message_source_->GetProcess();
-  render_process_host->FilterURL(false, &validated_url);
+  if (validated_url != GURL(content::kAboutSrcDocURL))
+    render_process_host->FilterURL(false, &validated_url);
 
   RenderFrameHostImpl* rfh =
       static_cast<RenderFrameHostImpl*>(render_frame_message_source_);