DevTools: Fix soft context menu font after r183724

Source/devtools/front_end/inspectorCommon.css

Index: Source/devtools/front_end/inspectorCommon.css
diff --git a/Source/devtools/front_end/inspectorCommon.css b/Source/devtools/front_end/inspectorCommon.css
index a746fe1b065c7f364a98e276a608d978be16b4b3..1158fc355b7c8e4c5dd82188d04c8766dc1c8160 100644
--- a/Source/devtools/front_end/inspectorCommon.css
+++ b/Source/devtools/front_end/inspectorCommon.css
@@ -19,16 +19,19 @@ body /deep/ .component-root {
     color: #222;
 }
 
+body.platform-linux,
 body.platform-linux /deep/ .component-root {
     color: rgb(48, 57, 66);
     font-family: Ubuntu, Arial, sans-serif;
 }
 
+body.platform-mac,
 body.platform-mac /deep/ .component-root {
     color: rgb(48, 57, 66);
     font-family: 'Lucida Grande', sans-serif;
 }
 
+body.platform-windows,
 body.platform-windows /deep/ .component-root {
     font-family: 'Segoe UI', Tahoma, sans-serif;
 }