diff --git a/browser/resources/extensions/extensions_resources.grd b/browser/resources/extensions/extensions_resources.grd
index aac129e3bfff..bc280770e483 100644
--- a/browser/resources/extensions/extensions_resources.grd
+++ b/browser/resources/extensions/extensions_resources.grd
@@ -10,8 +10,6 @@
   </outputs>
   <release seq="1">
     <structures>
-      <!-- included in chromium_src/chrome/browser/ui/webui/print_preview/print_preview_ui.cc -->
-      <structure name="IDR_BRAVE_PDF_VIEWPORT_JS" file="js_override/pdf/viewport.js" preprocess="true" type="chrome_html" />
     </structures>
     <includes>
       <include name="IDR_EXTENSIONS_BRAVE_ITEM_LIST_MORE_ITEMS_JS"
diff --git a/browser/resources/extensions/js_override/pdf/viewport.js b/browser/resources/extensions/js_override/pdf/viewport.js
deleted file mode 100644
index d2894439d0a7..000000000000
--- a/browser/resources/extensions/js_override/pdf/viewport.js
+++ /dev/null
@@ -1,8 +0,0 @@
-/* Copyright (c) 2019 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-<include src="../../../../../../chrome/browser/resources/pdf/viewport.js">
-
-Viewport.ZOOM_FACTORS = <include src="../../../settings/zoom_factors.json">;
diff --git a/browser/resources/settings/brave_settings_overrides.js b/browser/resources/settings/brave_settings_overrides.js
index a84d7c6b2485..e802762a66f7 100644
--- a/browser/resources/settings/brave_settings_overrides.js
+++ b/browser/resources/settings/brave_settings_overrides.js
@@ -103,17 +103,8 @@ const BraveClearSettingsMenuHighlightBehavior = {
   }
 }
 
-const BraveAddZoomLevelsBehavior = {
-  ready: function() {
-    this._setPageZoomLevels_(<include src="./zoom_factors.json">)
-  }
-}
-
 // Polymer Component Behavior injection (like superclasses)
 BravePatching.RegisterPolymerComponentBehaviors({
-  'settings-appearance-page': [
-    BraveAddZoomLevelsBehavior
-  ],
   'settings-clear-browsing-data-dialog': [
     BraveClearBrowsingDataOnExitBehavior
   ],
diff --git a/browser/resources/settings/zoom_factors.json b/browser/resources/settings/zoom_factors.json
deleted file mode 100644
index 05de8b17d8da..000000000000
--- a/browser/resources/settings/zoom_factors.json
+++ /dev/null
@@ -1,21 +0,0 @@
-[
-    0.25,
-    1 / 3,
-    0.5,
-    2 / 3,
-    0.75,
-    0.8,
-    0.9,
-    1,
-    1.1,
-    1.25,
-    4 / 3,
-    7 / 5,
-    1.5,
-    1.75,
-    2,
-    2.5,
-    3,
-    4,
-    5
-]
\ No newline at end of file
diff --git a/chromium_src/chrome/browser/ui/webui/print_preview/print_preview_ui.cc b/chromium_src/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
deleted file mode 100644
index efd2b7345868..000000000000
--- a/chromium_src/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
+++ /dev/null
@@ -1,12 +0,0 @@
-/* Copyright (c) 2019 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "chrome/grit/component_extension_resources.h"
-#include "brave/browser/resources/extensions/grit/brave_extensions_resources.h"
-
-#undef IDR_PDF_VIEWPORT_JS
-#define IDR_PDF_VIEWPORT_JS  IDR_BRAVE_PDF_VIEWPORT_JS
-#include "../../../../../../../chrome/browser/ui/webui/print_preview/print_preview_ui.cc"  // NOLINT
-#undef IDR_PDF_VIEWPORT_JS
diff --git a/chromium_src/components/zoom/page_zoom_constants.cc b/chromium_src/components/zoom/page_zoom_constants.cc
deleted file mode 100644
index 9155941a6c31..000000000000
--- a/chromium_src/components/zoom/page_zoom_constants.cc
+++ /dev/null
@@ -1,21 +0,0 @@
-/* Copyright (c) 2019 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "components/zoom/page_zoom_constants.h"
-
-#include "base/stl_util.h"
-
-namespace zoom {
-
-// This list is duplicated in brave/browser/resources/settings/zoom_factors.json
-// When changing this list, please make sure that gets updated also.
-const double kPresetZoomFactors[] = {0.25, 1 / 3.0, 0.5, 2 / 3.0, 0.75, 0.8,
-                                     0.9, 1.0, 1.1, 1.25, 4 / 3.0, 7 / 5.0,
-                                     1.5, 1.75, 2.0, 2.5,
-                                     3.0, 4.0, 5.0};
-const std::size_t kPresetZoomFactorsSize = base::size(kPresetZoomFactors);
-
-}  // namespace zoom
-