DevTools: Styling for blackbox regex UI dialog.

Source/devtools/front_end/helpScreen.css

 .help-window-outer {
     position: absolute !important;
     top: 0;
     left: 0;
     right: 0;
     bottom: 0;
     z-index: 2000;
 }
 
 .help-window-main {
@@ skipping 620 matching lines @@
 }
 
 .blackbox-patterns-list .settings-list-item .list-column.settings-list-column-value {
     width: 50%;
 }
 
 .excluded-folders-list .settings-list-item .list-column.settings-list-column-path {
     width: 100%;
 }
 
+.settings-tab .settings-list .settings-list-item.disabled .settings-list-column-pattern .list-column-text {
+    color: #666;
+    text-decoration: line-through;
+}
+
 .settings-dialog {
     border-radius: 3px;
     box-shadow: 0 4px 23px 5px rgba(0, 0, 0, 0.2), 0 2px 6px rgba(0,0,0,0.15);
     display: -webkit-flex;
     -webkit-flex-direction: column;
     background: white;
 }
 
 .settings-dialog .dialog-contents {
     display: flex;
@@ skipping 68 matching lines @@
     display: none;
 }
 
 .settings-experiment-hidden label {
     background-color: #ddd;
 }
 
 .settings-developer-mode .settings-experiment-hidden {
     display: block;
 }