Bug 1809742 - Remove dead tests and fixup comments manually. r=dshin

Differential Revision: https://phabricator.services.mozilla.com/D166601

layout/reftests/bugs/reftest.list

@@ -1372,7 +1372,7 @@ fuzzy(0-1,0-1200) == 512410.html 512410-ref.html
 fuzzy(0-1,0-4) == 513153-1a.html 513153-1-ref.html
 fuzzy(0-1,0-4) == 513153-1b.html 513153-1-ref.html
 pref(widget.non-native-theme.webrender,true) == 513153-2a.html 513153-2-ref.html # appleSilicon: bug 1724583
-fuzzy-if(cocoaWidget,0-112,0-108) == 513153-2b.html 513153-2-ref.html # !nativeThemePref and webrender only fuzzy when widget.non-native-theme.webrender=false, snapping difference
+fuzzy-if(cocoaWidget,0-112,0-108) == 513153-2b.html 513153-2-ref.html # only fuzzy when widget.non-native-theme.webrender=false, snapping difference
 == chrome://reftest/content/bugs/513318-1.xhtml chrome://reftest/content/bugs/513318-1-ref.xhtml
 fails-if(Android&&(!asyncPan)) != chrome://reftest/content/bugs/513318-2.xhtml chrome://reftest/content/bugs/513318-2-ref.xhtml
 == 514917-1.html 514917-1-ref.html

layout/reftests/forms/input/checkbox/reftest.list

@@ -11,7 +11,6 @@
 != indeterminate-native-checked.html indeterminate-native-checked-notref.html
 != indeterminate-native-unchecked.html indeterminate-native-unchecked-notref.html
 == indeterminate-selector.html indeterminate-selector-ref.html
-skip == gtk-theme-width-height.html gtk-theme-width-height-ref.html
 == checkbox-baseline.html checkbox-baseline-ref.html
 == checkbox-radio-color.html checkbox-radio-color-ref.html
 == checkbox-clamp-01.html checkbox-clamp-01-ref.html

layout/reftests/forms/input/radio/reftest.list

@@ -4,7 +4,6 @@
 == unchecked-appearance-none.html about:blank
 != checked-native.html about:blank
 != checked-native-notref.html about:blank
-skip == gtk-theme-width-height.html gtk-theme-width-height-ref.html
 == radio-clamp-01.html radio-clamp-01-ref.html
-skip-if(OSX||winWidget||Android) == radio-clamp-02.html radio-clamp-02-ref.html # gtkWidget, Bug 1599622
+skip-if(OSX||winWidget||Android) == radio-clamp-02.html radio-clamp-02-ref.html
 != radio-minimum-size.html radio-minimum-size-notref.html

layout/reftests/image-element/reftest.list

@@ -18,8 +18,8 @@ random-if(d2d) fuzzy-if(!useDrawSnapshot,255-255,39-42) == element-paint-transfo
 fuzzy(0-255,0-4) == element-paint-transform-repeated.html element-paint-transform-repeated-ref.html # Bug 1475907
 fuzzy-if(d2d,0-255,0-24) fuzzy-if(!useDrawSnapshot,255-255,50-115) == element-paint-transform-03.html element-paint-transform-03-ref.html
 
-# For !nativeThemePref: element() uses fallback / skia in WebRender, which antialiases differently from WR.
-# For !nativeThemePref+Windows+WebRender: bug 1496542, the scrollframe snaps differently.
+# For element() uses fallback / skia in WebRender, which antialiases differently from WR.
+# For Windows: bug 1496542, the scrollframe snaps differently.
 # For the rest: -ref the scrollframe is active and layerized differently with APZ.
 fuzzy(0-24,0-106) fuzzy-if(winWidget&&!layersGPUAccelerated,149-149,1203-1203) fuzzy-if(!useDrawSnapshot,1-48,5-68) fuzzy-if(winWidget,47-222,1197-1588) fuzzy-if(Android,0-40,0-81) == element-paint-native-widget.html element-paint-native-widget-ref.html
 

layout/reftests/native-theme/reftest.list

@@ -43,9 +43,6 @@ fails-if(Android&&!asyncPan) != 492155-4.html about:blank
 
 # RTL mirroring tests
 == checkbox-not-mirrored-when-rtl.html checkbox-not-mirrored-when-rtl-ref.html
-skip == chrome://reftest/content/native-theme/menulist-mirrored-when-rtl.xhtml chrome://reftest/content/native-theme/menulist-mirrored-when-rtl-ref.xhtml
-skip == chrome://reftest/content/native-theme/searchfield-mirrored-when-rtl.xhtml chrome://reftest/content/native-theme/searchfield-mirrored-when-rtl-ref.xhtml
-skip == select-mirrored-when-rtl.html select-mirrored-when-rtl-ref.html
 
 != chrome://reftest/content/native-theme/resizer-bottomend.xhtml chrome://reftest/content/native-theme/blank-window.xhtml
 random-if(d2d) == chrome://reftest/content/native-theme/resizer-bottomend.xhtml chrome://reftest/content/native-theme/resizer-bottomright.xhtml # bug 581086