Cherry-pick 266908@main (f452a97). https://bugs.webkit.org/show_bug.c…

…gi?id=249912

    REGRESSION(256929@main): [GLib] Extremely poor keyboard scrolling performance on various websites, view scrolls in wrong direction
    https://bugs.webkit.org/show_bug.cgi?id=249912

    Reviewed by Carlos Garcia Campos.

    Turn off the event driven smooth keyboard scrolling code. Unfortunately
    it does not work very well as of yet.

    * Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml:

    Canonical link: https://commits.webkit.org/266908@main

Canonical link: https://commits.webkit.org/266719.4@webkitglib/2.42

Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml

@@ -2425,7 +2425,6 @@ EventHandlerDrivenSmoothKeyboardScrollingEnabled:
       default: false
     WebKit:
       "PLATFORM(MAC)": WebKit::defaultScrollAnimatorEnabled()
-      "PLATFORM(GTK) || PLATFORM(WPE)": true
       default: false
     WebCore:
       default: false