Fix linear-gradient definition in dataGrid.css

Source/devtools/front_end/dataGrid.css

 .data-grid {
     position: relative;
     border: 1px solid #aaa;
     font-size: 11px;
     line-height: 120%;
 }
 
 .data-grid .highlight {
     background-color: rgb(255, 230, 179);
 }
@@ skipping 66 matching lines @@
 }
 
 .data-grid table.data {
     position: absolute;
     left: 0;
     top: 0;
     right: 0;
     bottom: 0;
     height: 100%;
     border-top: 0 none transparent;
-    background-image: linear-gradient(linear, to bottom, white, white 50%, rgb(234, 243, 255) 50%, rgb(234, 243, 255));
+    background-image: linear-gradient(to bottom, white, white 50%, rgb(234, 243, 255) 50%, rgb(234, 243, 255));
     background-size: 128px 32px;
     table-layout: fixed;
 }
 
 .data-grid.inline table.data {
     position: static;
 }
 
 .data-grid table.data tr {
     display: none;
@@ skipping 140 matching lines @@
     text-indent: 10px;
 }
 
 .data-grid-resizer {
     position: absolute;
     top: 0;
     bottom: 0;
     width: 5px;
     z-index: 500;
 }