Revert of Remove about:srcdoc url conversion.

content/public/test/test_frame_navigation_observer.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_TEST_TEST_FRAME_NAVIGATION_OBSERVER_H_
 #define CONTENT_TEST_TEST_FRAME_NAVIGATION_OBSERVER_H_
 
 #include <memory>
 #include <set>
 
@@ skipping 26 matching lines @@
   void Wait();
 
   // Runs a nested message loop and blocks until the navigation in the
   // associated FrameTreeNode has committed.
   void WaitForCommit();
 
  private:
   // WebContentsObserver
   void DidStartProvisionalLoadForFrame(RenderFrameHost* render_frame_host,
                                        const GURL& validated_url,
-                                       bool is_error_page) override;
+                                       bool is_error_page,
+                                       bool is_iframe_srcdoc) override;
   void DidCommitProvisionalLoadForFrame(
       RenderFrameHost* render_frame_host,
       const GURL& url,
       ui::PageTransition transition_type) override;
   void DidStopLoading() override;
 
   // The id of the FrameTreeNode in which navigations are peformed.
   int frame_tree_node_id_;
 
   // If true the navigation has started.
   bool navigation_started_;
 
   // If true, the navigation has committed.
   bool has_committed_;
 
   // If true, this object is waiting for commit only, not for the full load
   // of the document.
   bool wait_for_commit_;
 
   // The MessageLoopRunner used to spin the message loop.
   scoped_refptr<MessageLoopRunner> message_loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(TestFrameNavigationObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_FRAME_NAVIGATION_OBSERVER_H_