Apply content-security-policy to the HTML options page. This is a

chrome/browser/resources/shared/css/webui.css

Index: chrome/browser/resources/shared/css/webui.css
===================================================================
--- chrome/browser/resources/shared/css/webui.css	(revision 84688)
+++ chrome/browser/resources/shared/css/webui.css	(working copy)
@@ -1,38 +1,38 @@
-body {
-  background-color:white;
-  color:black;
-  margin:10px;
-}
-
-.header {
-  overflow:auto;
-  clear:both;
-}
-
-.header .logo {
-  float:left;
-}
-
-.header .form {
-  float:left;
-  margin-top:22px;
-  -webkit-margin-start:12px;
-}
-
-html[dir='rtl'] .logo {
-  float:right;
-}
-
-html[dir='rtl'] .form {
-  float:right;
-}
-
-.page-navigation {
-  padding:8px;
-  background-color:#ebeff9;
-  -webkit-margin-end:4px;
-}
-
-.footer {
-  height:24px;
-}
+body {
+  background-color:white;
+  color:black;
+  margin:10px;
+}
+
+.header {
+  overflow:auto;
+  clear:both;
+}
+
+.header .logo {
+  float:left;
+}
+
+.header .form {
+  float:left;
+  margin-top:22px;
+  -webkit-margin-start:12px;
+}
+
+html[dir='rtl'] .logo {
+  float:right;
+}
+
+html[dir='rtl'] .form {
+  float:right;
+}
+
+.page-navigation {
+  padding:8px;
+  background-color:#ebeff9;
+  -webkit-margin-end:4px;
+}
+
+.footer {
+  height:24px;
+}