Remove plumbing for inert-visual-viewport flag

components/html_viewer/blink_settings.cc

Index: components/html_viewer/blink_settings.cc
diff --git a/components/html_viewer/blink_settings.cc b/components/html_viewer/blink_settings.cc
index b9ee5943d6c1a527533119774a194d0b579890a1..3b33bd0f017c5392ae800859e72bfcffb812acdf 100644
--- a/components/html_viewer/blink_settings.cc
+++ b/components/html_viewer/blink_settings.cc
@@ -187,7 +187,6 @@ struct WebPreferences {
   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
@@ -384,7 +383,6 @@ WebPreferences::WebPreferences()
       navigate_on_drag_drop(true),
       v8_cache_options(V8_CACHE_OPTIONS_DEFAULT),
       slimming_paint_v2_enabled(false),
-      inert_visual_viewport(false),
       cookie_enabled(true),
       pepper_accelerated_video_decode_enabled(false),
       animation_policy(IMAGE_ANIMATION_POLICY_ALLOWED),
@@ -729,8 +727,6 @@ void ApplySettings(blink::WebView* web_view, bool test_mode) {
 
   settings->setSupportsMultipleWindows(prefs.supports_multiple_windows);
 
-  settings->setInertVisualViewport(prefs.inert_visual_viewport);
-
   // TODO(bokan): Remove once Blink side is gone.
   settings->setInvertViewportScrollOrder(true);