Merge 143588 - Update WebUI for HiDPI images added in r143476

chrome/browser/resources/plugins.css

Index: chrome/browser/resources/plugins.css
===================================================================
--- chrome/browser/resources/plugins.css	(revision 143846)
+++ chrome/browser/resources/plugins.css	(working copy)
@@ -25,7 +25,10 @@
 }
 
 #header h1 {
-  background: url('../../app/theme/default_100_percent/extensions_section.png') 0 20px no-repeat;
+  background: -webkit-image-set(
+      url('../../app/theme/default_100_percent/extensions_section.png') 1x,
+      url('../../app/theme/default_200_percent/extensions_section.png') 2x)
+      0 20px no-repeat;
   display: inline;
   margin: 0;
   padding-bottom: 20px;
@@ -34,7 +37,10 @@
 }
 
 html[dir=rtl] #header h1 {
-  background: url('../../app/theme/default_100_percent/extensions_section.png') right no-repeat;
+  background: -webkit-image-set(
+      url('../../app/theme/default_100_percent/extensions_section.png') 1x,
+      url('../../app/theme/default_200_percent/extensions_section.png') 2x)
+      right no-repeat;
   padding-left: 0;
   padding-right: 95px;
 }