VrShell: implement insecure content warning display

ui/webui/resources/images/i_circle.svg

Index: ui/webui/resources/images/i_circle.svg
diff --git a/ui/webui/resources/images/i_circle.svg b/ui/webui/resources/images/i_circle.svg
new file mode 100644
index 0000000000000000000000000000000000000000..ba7053bcfdbd3151858eb1bdafea130ab3d7364a
--- /dev/null
+++ b/ui/webui/resources/images/i_circle.svg
@@ -0,0 +1,14 @@
+<svg width="36px" height="36px"
+     viewBox="0 0 36 36" version="1.1"
+     xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink">
+  <g stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+    <path d="M18,0 C8.064,0 0,8.064 0,18 C0,27.936 8.064,36 18,36
+             C27.936,36 36,27.936 36,18 C36,8.064 27.936,0 18,0 L18,0 Z
+             M18,32 C10.2825,32 4,25.7175 4,18 C4,10.2825 10.2825,4 18,4
+             C25.7175,4 32,10.2825 32,18 C32,25.7175 25.7175,32 18,32
+             L18,32 Z M16,27 L20,27 L20,17 L16,17 L16,27 L16,27 Z M16,13
+             L20,13 L20,9 L16,9 L16,13 L16,13 Z"
+          fill="#5A5A5A"></path>
+  </g>
+</svg>