Remove plumbing for inert-visual-viewport flag

components/html_viewer/web_preferences.h

 // Copyright 2015 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 COMPONENTS_HTML_VIEWER_WEB_PREFERENCES_H_
 #define COMPONENTS_HTML_VIEWER_WEB_PREFERENCES_H_
 
 #include <map>
 #include <string>
 
@@ skipping 151 matching lines @@
   bool viewport_meta_enabled;
   bool main_frame_resizes_are_orientation_changes;
   bool initialize_at_minimum_page_scale;
   bool smart_insert_delete_enabled;
   bool spatial_navigation_enabled;
   int pinch_overlay_scrollbar_thickness;
   bool use_solid_color_scrollbars;
   bool navigate_on_drag_drop;
   V8CacheOptions v8_cache_options;
   bool slimming_paint_v2_enabled;
-  bool inert_visual_viewport;
 
   // This flags corresponds to a Page's Settings' setCookieEnabled state. It
   // only controls whether or not the "document.cookie" field is properly
   // connected to the backing store, for instance if you wanted to be able to
   // define custom getters and setters from within a unique security content
   // without raising a DOM security exception.
   bool cookie_enabled;
 
   // This flag indicates whether H/W accelerated video decode is enabled for
   // pepper plugins. Defaults to false.
@@ skipping 35 matching lines @@
   // We try to keep the default values the same as the default values in
   // chrome, except for the cases where it would require lots of extra work for
   // the embedder to use the same default value.
   WebPreferences();
   ~WebPreferences();
 };
 
 }  // namespace html_viewer
 
 #endif  // COMPONENTS_HTML_VIEWER_WEB_PREFERENCES_H_