Refactor GestureNavigation to eliminate code redundancy

content/browser/BUILD.gn

 # 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/browser/browser.gni")
 import("//media/media_options.gni")
 
@@ skipping 376 matching lines @@
       "renderer_host/render_widget_host_view_aura.cc",
       "renderer_host/render_widget_host_view_aura.h",
       "renderer_host/ui_events_helper.cc",
       "renderer_host/ui_events_helper.h",
       "renderer_host/web_input_event_aura.cc",
       "renderer_host/web_input_event_aura.h",
       "web_contents/aura/gesture_nav_simple.cc",
       "web_contents/aura/gesture_nav_simple.h",
       "web_contents/aura/overscroll_navigation_overlay.cc",
       "web_contents/aura/overscroll_navigation_overlay.h",
+      "web_contents/aura/overscroll_window_animation.cc",
+      "web_contents/aura/overscroll_window_animation.h",
+      "web_contents/aura/overscroll_window_delegate.cc",
+      "web_contents/aura/overscroll_window_delegate.h",
       "web_contents/aura/shadow_layer_delegate.cc",
       "web_contents/aura/shadow_layer_delegate.h",
-      "web_contents/aura/window_slider.cc",
-      "web_contents/aura/window_slider.h",
       "web_contents/touch_editable_impl_aura.cc",
       "web_contents/touch_editable_impl_aura.h",
       "web_contents/web_contents_view_aura.cc",
       "web_contents/web_contents_view_aura.h",
     ]
   }
 
   if (use_aura || is_mac) {
     sources +=
         rebase_path(content_browser_gypi_values.compositor_browser_sources,
@@ skipping 38 matching lines @@
   }
 
   if (is_linux && use_openssl) {
     deps += [ "//third_party/boringssl" ]
   }
 
   if (enable_media_mojo_renderer) {
     deps += [ "//media/mojo/services:renderer_service" ]
   }
 }