Fix linear-gradient definition in dataGrid.css

Source/devtools/front_end/dataGrid.css

Index: Source/devtools/front_end/dataGrid.css
diff --git a/Source/devtools/front_end/dataGrid.css b/Source/devtools/front_end/dataGrid.css
index 2a9dbe70f3df7d18eb5a0c973ae902b958f406f8..2beb9ebbf19a8851d11e9fa070b0b439e50b9883 100644
--- a/Source/devtools/front_end/dataGrid.css
+++ b/Source/devtools/front_end/dataGrid.css
@@ -84,7 +84,7 @@
     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;
 }