DevTools: Network Panel: remove a bit of css poison.

Source/devtools/front_end/networkPanel.css

Index: Source/devtools/front_end/networkPanel.css
diff --git a/Source/devtools/front_end/networkPanel.css b/Source/devtools/front_end/networkPanel.css
index 00fbdf1cea189eff1c96ac24fe67639b836eed64..19c441c4ba557d898fa7bf3d82cc777f78611ce6 100644
--- a/Source/devtools/front_end/networkPanel.css
+++ b/Source/devtools/front_end/networkPanel.css
@@ -112,12 +112,12 @@
     display: block;
 }
 
-.resource-headers-view .outline-disclosure .parent {
+.resource-headers-view .outline-disclosure > .parent {
     -webkit-user-select: none;
     font-weight: bold;
 }
 
-.resource-headers-view .outline-disclosure .parent .section * {
+.resource-headers-view .outline-disclosure > .parent > .section {
     font-weight: normal;
 }