DevTools: migrate navigator icons to UI.Icon

third_party/WebKit/Source/devtools/front_end/ui/treeoutline.css

Index: third_party/WebKit/Source/devtools/front_end/ui/treeoutline.css
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/treeoutline.css b/third_party/WebKit/Source/devtools/front_end/ui/treeoutline.css
index 4d7c9b8e86049ce93d22448b0c6326fc69764ff0..733e68f313707ea39e1732c6118c2fa96a92de83 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/treeoutline.css
+++ b/third_party/WebKit/Source/devtools/front_end/ui/treeoutline.css
@@ -88,7 +88,13 @@ ol.tree-outline:focus li.selected * {
     color: inherit;
 }
 
-.tree-outline li .icons-container {
+.tree-outline li .leading-icons {
+    align-self: center;
+    display: flex;
+    align-items: center;
+}
+
+.tree-outline li .trailing-icons {
     margin-left: 4px;
     align-self: center;
 }