Disable overscroll on Windows machines w/o touchscreen

content/browser/frame_host/navigation_controller_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_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
@@ skipping 179 matching lines @@
     max_entry_count_for_testing_ = max_entry_count;
   }
   static size_t max_entry_count();
 
   void SetGetTimestampCallbackForTest(
       const base::Callback<base::Time()>& get_timestamp_callback);
 
   // Takes a screenshot of the page at the current state.
   void TakeScreenshot();
 
+  bool ShouldTakeScreenshotOnNavigation();
+
   // Sets the screenshot manager for this NavigationControllerImpl. The
   // controller takes ownership of the screenshot manager and destroys it when
   // a new screenshot-manager is set, or when the controller is destroyed.
   // Setting a NULL manager recreates the default screenshot manager and uses
   // that.
   void SetScreenshotManager(NavigationEntryScreenshotManager* manager);
 
   // Discards only the pending entry.
   void DiscardPendingEntry();
 
@@ skipping 203 matching lines @@
   TimeSmoother time_smoother_;
 
   scoped_ptr<NavigationEntryScreenshotManager> screenshot_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_