Avoid unnecessary casts in NavigationControllerImpl.

content/browser/web_contents/web_contents_view_aura.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/metrics/histogram.h"
@@ skipping 108 matching lines @@
 // destroyed.
 class OverscrollWindowDelegate : public aura_extra::ImageWindowDelegate {
  public:
   OverscrollWindowDelegate(WebContentsImpl* web_contents,
                            OverscrollMode overscroll_mode)
       : web_contents_(web_contents),
         forward_events_(true) {
     const NavigationControllerImpl& controller = web_contents->GetController();
     const NavigationEntryImpl* entry = NULL;
     if (ShouldNavigateForward(controller, overscroll_mode)) {
-      entry = NavigationEntryImpl::FromNavigationEntry(
-          controller.GetEntryAtOffset(1));
+      entry = controller.GetEntryAtOffset(1);
     } else if (ShouldNavigateBack(controller, overscroll_mode)) {
-      entry = NavigationEntryImpl::FromNavigationEntry(
-          controller.GetEntryAtOffset(-1));
+      entry = controller.GetEntryAtOffset(-1);
     }
 
     gfx::Image image;
     if (entry && entry->screenshot().get()) {
       std::vector<gfx::ImagePNGRep> image_reps;
       image_reps.push_back(gfx::ImagePNGRep(entry->screenshot(), 1.0f));
       image = gfx::Image(image_reps);
     }
     SetImage(image);
   }
@@ skipping 1501 matching lines @@
   if (visible) {
     if (!web_contents_->should_normally_be_visible())
       web_contents_->WasShown();
   } else {
     if (web_contents_->should_normally_be_visible())
       web_contents_->WasHidden();
   }
 }
 
 }  // namespace content