Fixing a typo which caused OverscrollNavigationOverlay to be created even when disabled.

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 928 matching lines @@
 
 void WebContentsViewAura::SetOverscrollControllerEnabled(bool enabled) {
   RenderWidgetHostViewAura* view =
       ToRenderWidgetHostViewAura(web_contents_->GetRenderWidgetHostView());
   if (view) {
     view->SetOverscrollControllerEnabled(enabled);
     if (enabled)
       InstallOverscrollControllerDelegate(view);
   }
 
-  if (!enabled)
+  if (!enabled) {
     navigation_overlay_.reset();
-  if (!navigation_overlay_) {
+  } else if (!navigation_overlay_) {
     navigation_overlay_.reset(
         new OverscrollNavigationOverlay(web_contents_, window_.get()));
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsViewAura, RenderViewHostDelegateView implementation:
 
 void WebContentsViewAura::ShowContextMenu(RenderFrameHost* render_frame_host,
                                           const ContextMenuParams& params) {
@@ skipping 382 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