[Controls Refresh] Updates dark mode styling for text input native controls

This change uses native_theme_base.cc to update the styling for the text input native controls in dark mode.

Change-Id: I974f40933b755016aad46607f40f3899d8349be6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303604Reviewed-by: Yu Han <yuzhehan@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Sam Sebree <sasebree@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#790086}

ui/native_theme/native_theme_base.cc

@@ -1664,6 +1664,7 @@ SkColor NativeThemeBase::GetDarkModeControlColor(
     case kBackground:
       return SkColorSetRGB(0x3B, 0x3B, 0x3B);
     case kBorder:
+      return SkColorSetRGB(0x85, 0x85, 0x85);
     case kSlider:
       return SkColorSetRGB(0xC3, 0xC3, 0xC3);
     case kHoveredSlider: