[web_dev_style] Changing :pseudo-element to ::pseudo-element to match

chrome/browser/resources/file_manager/css/common.css

Index: chrome/browser/resources/file_manager/css/common.css
diff --git a/chrome/browser/resources/file_manager/css/common.css b/chrome/browser/resources/file_manager/css/common.css
index 2b446f7e319a623021ce5310e169c2b5e5904638..bc9122cc16b1fb9be774d98224229f62fd2036d1 100644
--- a/chrome/browser/resources/file_manager/css/common.css
+++ b/chrome/browser/resources/file_manager/css/common.css
@@ -43,7 +43,7 @@ input.common[type='checkbox'].white {
   border: none;
 }
 
-input.common[type='checkbox'].white:not(:checked):after {
+input.common[type='checkbox'].white:not(:checked)::after {
   background-image: -webkit-image-set(
     url('../images/common/checkbox_white_unchecked.png') 1x,
     url('../images/common/2x/checkbox_white_unchecked.png') 2x);
@@ -308,7 +308,7 @@ menu.chrome-menu > :not(hr)[checked] {
   background-position: 2px center;
 }
 
-menu.chrome-menu > [checked]:before {
+menu.chrome-menu > [checked]::before {
   display: none;
 }