Indent media queries in CSS files for the DevTools.

Source/devtools/front_end/timelinePanel.css

Index: Source/devtools/front_end/timelinePanel.css
diff --git a/Source/devtools/front_end/timelinePanel.css b/Source/devtools/front_end/timelinePanel.css
index 62a3050f0da9bcf0b88d7c46c944ae13a2c69200..f04e77fcce6fea2e20ad4a3dcac291f2e8f18525 100644
--- a/Source/devtools/front_end/timelinePanel.css
+++ b/Source/devtools/front_end/timelinePanel.css
@@ -182,7 +182,7 @@
 .timeline-category-checkbox-checked {
     background-image: url(Images/statusbarButtonGlyphs2x.png);
 }
-}
+} /* media */
 
 .timeline-tree-item {
     height: 18px;
@@ -225,7 +225,7 @@
 .timeline-expandable-arrow {
     background-image: url(Images/statusbarButtonGlyphs2x.png);
 }
-}
+} /* media */
 
 .timeline-expandable-collapsed .timeline-expandable-arrow {
     background-position: -4px -96px;
@@ -280,7 +280,7 @@
 .timeline-tree-item.child-warning::after {
     background-image: url(Images/statusbarButtonGlyphs2x.png);
 }
-}
+} /* media */
 
 .timeline-tree-item.child-warning::after {
     opacity: 0.5;
@@ -481,7 +481,7 @@
 #timeline-overview-sidebar .icon {
     -webkit-mask-image: url(Images/statusbarButtonGlyphs2x.png);
 }
-}
+} /* media */
 
 .timeline-overview-sidebar-events .icon {
     -webkit-mask-position: -192px -48px;