Restored custom zoom values.

#4092 was reverted in a separate
commit because it is now in Chromium:
https://chromium.googlesource.com/chromium/src/+/08b57c09851e2bdcb39ea70e46707f3bab6a0a4a

The only difference upstream is 2 additional zoom values we had in
Brave.

This readds those values (4 / 3.0 and 7 / 5.0).

chromium_src/components/zoom/page_zoom_constants.cc

@@ -0,0 +1,21 @@
+/* Copyright (c) 2020 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"
+
+#define kPresetZoomFactors kPresetZoomFactors_ChromiumImpl
+#define kPresetZoomFactorsSize kPresetZoomFactorsSize_ChromiumImpl
+#include "../../../../components/zoom/page_zoom_constants.cc"
+#undef kPresetZoomFactors
+#undef kPresetZoomFactorsSize
+
+namespace zoom {
+
+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