Initial updates for Reader View.

toolkit/themes/shared/reader/RM-Line-Height-Plus-38x24.svg

@@ -1,13 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
 
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
-<svg version="1.1"
-     xmlns="http://www.w3.org/2000/svg"
-     xmlns:xlink="http://www.w3.org/1999/xlink"
+<svg xmlns="http://www.w3.org/2000/svg"
      width="38"
      height="24"
      viewBox="0 0 38 24"