Prevent modal dialogs when preparing to swap out.

content/browser/renderer_host/render_view_host_impl.h

 // Copyright (c) 2012 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_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 271 matching lines @@
   // page, making it unsafe to show the pending URL.  Always false after the
   // first commit.
   bool has_accessed_initial_document() {
     return has_accessed_initial_document_;
   }
 
   // Whether this RenderViewHost has been swapped out to be displayed by a
   // different process.
   bool is_swapped_out() const { return is_swapped_out_; }
 
+  // Tells the renderer that this RenderView will soon be swapped out, and thus
+  // not to create any new modal dialogs until it happens.  This must be done
+  // separately so that the PageGroupLoadDeferrers of any current dialogs are no
+  // longer on the stack when we attempt to swap it out.
+  void SuppressDialogsUntilSwapOut();
+
   // Tells the renderer that this RenderView is being swapped out for one in a
   // different renderer process.  It should run its unload handler and move to
   // a blank document.  The renderer should preserve the Frame object until it
   // exits, in case we come back.  The renderer can exit if it has no other
   // active RenderViews, but not until WasSwappedOut is called (when it is no
   // longer visible).
   void SwapOut();
 
   // Called when either the SwapOut request has been acknowledged or has timed
   // out.
@@ skipping 428 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_