[MD settings] remove icons from wallpaper and themes rows; avoid opening theme page on reset

chrome/browser/resources/settings/icons.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-iconset-svg/iron-iconset-svg.html">
 
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@@ skipping 89 matching lines @@
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