Revert "Enable property-no-vendor-prefix stylelint check"

This reverts commit 190803bad8b5a4cbe714bced86e72f3b6bc2fffc.

Reason for revert: This breaks the icons in DevTools, which leaves gray backgrounds behind.

Original change's description:
> Enable property-no-vendor-prefix stylelint check
> 
> This patch drops unnecessary -webkit- prefixes in CSS and enables
> a lint check to enforce that prevent such properties from being
> added in the future. Note that the use of vendor-prefixed CSS
> properties is still accepted in cases where there is no standardized
> and browser-supported alternative.
> 
> Bug: chromium:1104187
> Change-Id: I29ae93d5a760c4f5037f20663754f448b5083235
> Fixed: chromium:1031475
> Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2297386
> Reviewed-by: Changhao Han <[email protected]>
> Commit-Queue: Mathias Bynens <[email protected]>

[email protected],[email protected]

Change-Id: I5fe13b7afd8b71180163c7419092cc6a758903b6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1104187
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2297391
Reviewed-by: Tim van der Lippe <[email protected]>
Commit-Queue: Tim van der Lippe <[email protected]>
diff --git a/front_end/ui/checkboxTextLabel.css b/front_end/ui/checkboxTextLabel.css
index 1cea4bf..d1b4703 100644
--- a/front_end/ui/checkboxTextLabel.css
+++ b/front_end/ui/checkboxTextLabel.css
@@ -28,7 +28,7 @@
 }
 
 input.dt-checkbox-themed {
-  appearance: none;
+  -webkit-appearance: none;
   margin: auto 5px auto 2px;
   border: 1px solid rgb(45 45 45);
   border-radius: 3px;
@@ -43,9 +43,9 @@
   width: 12px;
   height: 12px;
   background: none;
-  mask-image: url(Images/checkboxCheckmark.svg);
-  mask-size: 11px 11px;
-  mask-position: 0 0;
+  -webkit-mask-image: url(Images/checkboxCheckmark.svg);
+  -webkit-mask-size: 11px 11px;
+  -webkit-mask-position: 0 0;
 }
 
 input.dt-checkbox-themed:checked::after {