DevTools: migrate SoftContextMenu icons over to UI.Icon

third_party/WebKit/Source/devtools/front_end/ui/softContextMenu.css

Index: third_party/WebKit/Source/devtools/front_end/ui/softContextMenu.css
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/softContextMenu.css b/third_party/WebKit/Source/devtools/front_end/ui/softContextMenu.css
index b336a3920be056cefa14be7154cd248063f3845a..516df5a0c030ac685104cf83c108cd003b6a751a 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/softContextMenu.css
+++ b/third_party/WebKit/Source/devtools/front_end/ui/softContextMenu.css
@@ -97,19 +97,11 @@
 }
 
 .checkmark {
-    background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 352px 168px;
     opacity: 0.7;
-    width: 10px;
-    height: 10px;
-    background-position: -128px -109px;
-    display: inline-block;
     pointer-events: none;
     margin: auto 5px auto 0px;
 }
 
-@media (-webkit-min-device-pixel-ratio: 1.1) {
-.checkmark {
-    background-image: url(Images/toolbarButtonGlyphs_2x.png);
-}
-}
+.soft-context-menu-item-mouse-over .checkmark {
+    opacity: 1;
+}