[Webkit-unassigned] [Bug 251183] New: Restrict the set of defaults-overridable flags to better match shipping Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251183

            Bug ID: 251183
           Summary: Restrict the set of defaults-overridable flags to
                    better match shipping Safari
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

The new feature generator logic attempts to persist all `internal` feature flags such that a developer can use a 'WebKitDebug'-prefix for a setting to override it. This is only desired for a small set of feature flags (those that lived in the Source/WTF/Scripts/Preferences/WebPreferencesDebug.yaml file previously).

This patch does the following:

1. Corrects a handful of feature flags that were moved from `internal` to `embedder`, improperly.
2. Adds a new key, `defaultsOverridable` to UnifiedWebPreferences.yaml. Flags that have this key with a `true` value will get additional logic to support 'WebKitDebug'-prefix overrides.

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