Revert of Remove about:srcdoc url conversion.

chrome/browser/extensions/api/web_navigation/frame_navigation_state.h

Index: chrome/browser/extensions/api/web_navigation/frame_navigation_state.h
diff --git a/chrome/browser/extensions/api/web_navigation/frame_navigation_state.h b/chrome/browser/extensions/api/web_navigation/frame_navigation_state.h
index 97de022098e1c3d32dba4e679422bb3603e9174c..1647dad0db492156a0a1b28c218c8aae28331e6b 100644
--- a/chrome/browser/extensions/api/web_navigation/frame_navigation_state.h
+++ b/chrome/browser/extensions/api/web_navigation/frame_navigation_state.h
@@ -42,7 +42,8 @@
   void StartTrackingDocumentLoad(content::RenderFrameHost* frame_host,
                                  const GURL& url,
                                  bool is_same_page,
-                                 bool is_error_page);
+                                 bool is_error_page,
+                                 bool is_iframe_srcdoc);
 
   // Adds the |frame_host| to the set of RenderFrameHosts associated with the
   // WebContents this object is tracking. This method and FrameHostDeleted
@@ -96,6 +97,7 @@
     FrameState();
 
     bool error_occurred;  // True if an error has occurred in this frame.
+    bool is_iframe_srcdoc;  // True if the frame is displaying its srcdoc.
     bool is_loading;        // True if there is a document load going on.
     bool is_parsing;  // True if the frame is still parsing.
     GURL url;  // URL of this frame.