Print Preview: Changing visuals for the checkboxes to be checkmarks.

chrome/browser/resources/print_preview.css

 html {
   height: 100%;
 }
 
 body {
   background: white;
   display: -webkit-box;
   height: 100%;
   margin: 0;
   overflow: hidden;
@@ skipping 206 matching lines @@
 }
 
 button.loading {
   cursor: progress;
 }
 
 button.default {
   -webkit-padding-end: 21px;
   -webkit-padding-start: 21px;
   border-color: #808080;
-  border-width: 2px;
-  font-weight: 600;
+  font-weight: bold;
 }
 
 button.default:disabled {
   border-color: #a0a0a0;
 }
 
 #increment,
 #decrement {
   -webkit-padding-end: 8px;
   -webkit-padding-start: 8px;
@@ skipping 75 matching lines @@
 input[type='checkbox']:active {
   -webkit-box-shadow: inset 0 1px 3px rgba(0, 0, 0, .2);
   background: -webkit-linear-gradient(#f0f0f0, #bebebe);
   border: 1px solid #808080;
   padding-bottom: 4px;
   padding-top: 6px;
   text-shadow: 0 1px 0 rgba(255, 255, 255, .25);
 }
 
 input[type='checkbox']:checked:before {
-  -webkit-box-shadow: 0 1px 0 rgba(255, 255, 255, .5);
   color: #808080;
-  content: '×';
-  display: inline-block;
-  font-size: 21px;
-  font-weight: bold;
+  content: url('./print_preview/checkmark.png');
   height: 16px;
-  line-height: 16px;
+  left: 2px;
   opacity: 1;
-  overflow: hidden;
   position: absolute;
-  text-align: center;
-  top: -1px;
-  width: 16px;
 }
 
 input[type='radio'] {
   -webkit-box-shadow: inset 0 1px 2px white,
                       0 1px 2px rgba(0, 0, 0, .2);
   -webkit-appearance: none;
   -webkit-margin-end: 5px;
   -webkit-transition: border 500ms;
   background: -webkit-linear-gradient(#fafafa, #dcdcdc);
   border-radius: 100%;
@@ skipping 35 matching lines @@
   height: 5px;
   left: 0;
   margin-top: 4px;
   opacity: 1;
   position: absolute;
   top: 0;
   vertical-align: top;
   width: 5px;
 }
 
-html[dir='rtl'] input[type='checkbox']:checked:before,
 html[dir='rtl'] input[type='radio']:checked:before {
   right: 0;
 }
 
 input[type='radio']:active:checked:before {
   background: #606060;
 }
 
 input[type='text'] {
   -webkit-box-shadow: inset 0 2px 2px rgba(0, 0, 0, .1),
@@ skipping 317 matching lines @@
   -webkit-animation-delay: 300ms;
 }
 
 #two-sided-div {
   margin-top: 10px;
 }
 
 input[disabled] + label {
   color: gray;
 }