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

* selector is not required.

BUG=316092

Review URL: https://codereview.chromium.org/420193004

git-svn-id: svn://svn.chromium.org/blink/trunk@179013 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/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;
 }