Revert 143362 - Merge 142936 - Click on empty space clears selection in single selection list on Ma…

chrome/browser/resources/shared/js/cr/ui/list_selection_controller.js

Index: chrome/browser/resources/shared/js/cr/ui/list_selection_controller.js
===================================================================
--- chrome/browser/resources/shared/js/cr/ui/list_selection_controller.js	(revision 143397)
+++ chrome/browser/resources/shared/js/cr/ui/list_selection_controller.js	(working copy)
@@ -129,9 +129,10 @@
         // On Mac we always clear the selection if the user clicks a blank area.
         // On Windows, we only clear the selection if neither Shift nor Ctrl are
         // pressed.
-        if (cr.isMac || cr.isChromeOS) {
+        if (cr.isMac) {
           sm.leadIndex = sm.anchorIndex = -1;
-          sm.unselectAll();
+          if (sm.multiple)
+            sm.unselectAll();
         } else if (!isDown && !e.shiftKey && !e.ctrlKey)
           // Keep anchor and lead indexes. Note that this is intentionally
           // different than on the Mac.
@@ -263,7 +264,7 @@
           } else {
             sm.selectRange(anchorIndex, newIndex);
           }
-        } else if (e.ctrlKey && !cr.isMac && !cr.isChromeOS) {
+        } else if (e.ctrlKey && !cr.isMac) {
           // Setting the lead index is done above.
           // Mac does not allow you to change the lead.
         } else {