DevTools: follow up to r196782 with minor UI fixed.

Source/devtools/front_end/sources/uiList.css

Index: Source/devtools/front_end/sources/uiList.css
diff --git a/Source/devtools/front_end/sources/uiList.css b/Source/devtools/front_end/sources/uiList.css
index 90cecca1358240956c956a2b63d96070fb2df9bd..bab2a8f88f95861ad655462cb63ea0901f008170 100644
--- a/Source/devtools/front_end/sources/uiList.css
+++ b/Source/devtools/front_end/sources/uiList.css
@@ -11,17 +11,20 @@
     white-space: nowrap;
 }
 
-.list-item:hover {
-    background-color: #eee;
+.list-item:nth-of-type(2n) {
+    background-color: #f8f8f8;
 }
 
-.list-item > .title::before {
-    content: "\2713 ";
-    color: transparent;
+.list-item.selected {
+    background-color: rgb(212, 212, 212);
 }
 
-.list-item.selected > .title::before {
-    color: inherit;
+.list-item.selected > .title {
+    font-weight: bold;
+}
+
+.list-item:hover {
+    background-color: #eee;
 }
 
 .list-item > .title {
@@ -30,10 +33,6 @@
     white-space: normal;
 }
 
-.list-item.selected > .title {
-    font-weight: bold;
-}
-
 .list-item > .subtitle {
     margin-left: 5px;
     color: rgba(0, 0, 0, 0.7);