Follow-up to bug 548027: remove spurious duplicate ids on <circle> elements

browser/base/content/browser.xul

@@ -645,11 +645,11 @@
   <svg:svg height="0">
     <svg:mask id="winstripe-keyhole-forward-mask" maskContentUnits="objectBoundingBox">
       <svg:rect x="0" y="0" width="1" height="1" fill="white"/>
-      <svg:circle cx="-0.46" cy="0.5" r="0.63" id="circle"/>
+      <svg:circle cx="-0.46" cy="0.5" r="0.63"/>
     </svg:mask>
     <svg:mask id="winstripe-keyhole-forward-mask-hover" maskContentUnits="objectBoundingBox">
       <svg:rect x="0" y="0" width="1" height="1" fill="white"/>
-      <svg:circle cx="-0.35" cy="0.5" r="0.58" id="circle"/>
+      <svg:circle cx="-0.35" cy="0.5" r="0.58"/>
     </svg:mask>
   </svg:svg>
 #endif

browser/themes/winstripe/browser/keyhole-forward-mask.svg

@@ -2,10 +2,10 @@
 <svg xmlns="http://www.w3.org/2000/svg">
   <mask id="mask" maskContentUnits="objectBoundingBox">
     <rect x="0" y="0" width="1" height="1" fill="white"/>
-    <circle cx="-0.46" cy="0.5" r="0.63" id="circle"/>
+    <circle cx="-0.46" cy="0.5" r="0.63"/>
   </mask>
   <mask id="mask-hover" maskContentUnits="objectBoundingBox">
     <rect x="0" y="0" width="1" height="1" fill="white"/>
-    <circle cx="-0.35" cy="0.5" r="0.58" id="circle"/>
+    <circle cx="-0.35" cy="0.5" r="0.58"/>
   </mask>
 </svg>