Avoid unnecessary casts in NavigationControllerImpl.

content/browser/web_contents/aura/overscroll_navigation_overlay.cc

 // 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.
 
 #include "content/browser/web_contents/aura/overscroll_navigation_overlay.h"
 
 #include "content/browser/frame_host/navigation_entry_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/view_messages.h"
@@ skipping 190 matching lines @@
   image_delegate_ = NULL;
   if (overlay_dismiss_layer.get()) {
     // OverlayDismissAnimator deletes overlay_dismiss_layer and itself when the
     // animation completes.
     (new OverlayDismissAnimator(overlay_dismiss_layer.Pass()))->Animate();
   }
 }
 
 ui::Layer* OverscrollNavigationOverlay::CreateSlideLayer(int offset) {
   const NavigationControllerImpl& controller = web_contents_->GetController();
-  const NavigationEntryImpl* entry = NavigationEntryImpl::FromNavigationEntry(
-      controller.GetEntryAtOffset(offset));
+  const NavigationEntryImpl* entry = controller.GetEntryAtOffset(offset);
 
   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);
   }
   if (!layer_delegate_)
     layer_delegate_.reset(new ImageLayerDelegate());
   layer_delegate_->SetImage(image);
@@ skipping 84 matching lines @@
 
 void OverscrollNavigationOverlay::DidStopLoading(RenderViewHost* host) {
   // Don't compare URLs in this case - it's possible they won't match if
   // a gesture-nav initiated navigation was interrupted by some other in-site
   // navigation ((e.g., from a script, or from a bookmark).
   loading_complete_ = true;
   StopObservingIfDone();
 }
 
 }  // namespace content