Fix history nav to a script-injected about:blank frame.

content/renderer/render_frame_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 #define CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
+#include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/id_map.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
@@ skipping 1080 matching lines @@
   // layout, etc. A local frame is also a local root iff it does not have a
   // parent that is a local frame.
   scoped_refptr<RenderWidget> render_widget_;
 
   // Temporarily holds state pertaining to a navigation that has been initiated
   // until the NavigationState corresponding to the new navigation is created in
   // didCreateDataSource().
   std::unique_ptr<NavigationParams> pending_navigation_params_;
 
   // Keeps track of which future subframes the browser process has history items
-  // for during a history navigation.  The renderer process should ask the
-  // browser for history items when subframes with these names are created, and
-  // directly load the initial URLs for any other subframes.  This state is
-  // incrementally cleared as it is used and then reset in didStopLoading, since
-  // it is not needed after the first load completes and is never used after the
-  // initial navigation.
+  // for during a history navigation, as well as whether those items are for
+  // about:blank.  The renderer process should ask the browser for history items
+  // when subframes with these names are created (as long as they are not
+  // staying at about:blank), and directly load the initial URLs for any other
+  // subframes.
+  //
+  // This state is incrementally cleared as it is used and then reset in
+  // didStopLoading, since it is not needed after the first load completes and
+  // is never used after the initial navigation.
   // TODO(creis): Expand this to include any corresponding same-process
   // PageStates for the whole subtree in https://crbug.com/639842.
-  std::set<std::string> history_subframe_unique_names_;
+  std::map<std::string, bool> history_subframe_unique_names_;
 
   // Stores the current history item for this frame, so that updates to it can
   // be reported to the browser process via SendUpdateState.
   blink::WebHistoryItem current_history_item_;
 
 #if defined(ENABLE_PLUGINS)
   // Current text input composition text. Empty if no composition is in
   // progress.
   base::string16 pepper_composition_text_;
 
@@ skipping 179 matching lines @@
   bool name_changed_before_first_commit_ = false;
 
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_