Bug 1485830 - Set custom odd tree row colors in common.css on all platforms. r=dao

Differential Revision: https://phabricator.services.mozilla.com/D5963

--HG--
extra : moz-landing-system : lando

toolkit/themes/linux/global/in-content/common.css

@@ -75,22 +75,6 @@ html|input[type="checkbox"]:-moz-focusring + html|label:before {
   outline: 1px dotted;
 }
 
-xul|treechildren::-moz-tree-row(multicol, odd) {
-  background-color: var(--in-content-box-background-odd);
-}
-
-/* These rules are duplicated from common.inc.css
- * because above -moz-tree-row(multicol, odd) rule
- * overrides also hover/selected states.
- */
-xul|treechildren::-moz-tree-row(hover) {
-  background-color: var(--in-content-item-hover);
-}
-
-xul|treechildren::-moz-tree-row(selected) {
-  background-color: var(--in-content-item-selected);
-}
-
 html|button {
   /* XUL button min-width */
   min-width: 6.3em;

toolkit/themes/shared/in-content/common.inc.css

@@ -709,6 +709,10 @@ xul|treechildren::-moz-tree-row {
   background-image: none;
 }
 
+xul|treechildren::-moz-tree-row(multicol, odd) {
+  background-color: var(--in-content-box-background-odd);
+}
+
 html|select[size][multiple] > html|option:hover,
 xul|treechildren::-moz-tree-row(hover) {
   background-color: var(--in-content-item-hover);

toolkit/themes/windows/global/in-content/common.css

@@ -4,6 +4,10 @@
 
 %include ../../../shared/in-content/common.inc.css
 
+:root {
+  --in-content-box-background-odd: transparent;
+}
+
 xul|caption {
   background-color: transparent;
 }