MD Settings: Fix search highlighting within extension-controlled-indicator.

chrome/browser/resources/settings/controls/extension_controlled_indicator.html

Index: chrome/browser/resources/settings/controls/extension_controlled_indicator.html
diff --git a/chrome/browser/resources/settings/controls/extension_controlled_indicator.html b/chrome/browser/resources/settings/controls/extension_controlled_indicator.html
index 85702c8112fe9c10cd19ace0e8c8ccadb7f35334..ff53538c98f4d4e408b877e8b71adeb0d0bddb30 100644
--- a/chrome/browser/resources/settings/controls/extension_controlled_indicator.html
+++ b/chrome/browser/resources/settings/controls/extension_controlled_indicator.html
@@ -21,7 +21,10 @@
         -webkit-margin-end: 16px;
       }
 
-      span {
+      /* Using ">" operator to ensure that this CSS rule will not accidentally
+       * be applied to a search highlight span (which is inserted dynamically if
+       * when search "hit" occurs within this element. */
+      :host > span {
         -webkit-margin-end: 8px;
         flex: 1;
       }