DevTools: Split NetworkPanel.js

Source/devtools/front_end/network/requestHeadersView.css

Index: Source/devtools/front_end/network/requestHeadersView.css
diff --git a/Source/devtools/front_end/network/requestHeadersView.css b/Source/devtools/front_end/network/requestHeadersView.css
index 20047d5aab1852a4d22518161805a43ef1c992cd..6759fb0a71b44556a411017371dfeca3b6164bbb 100644
--- a/Source/devtools/front_end/network/requestHeadersView.css
+++ b/Source/devtools/front_end/network/requestHeadersView.css
@@ -35,6 +35,9 @@
     -webkit-mask-position: -20px -98px;
 }
 
+.request-headers-view .properties-tree li.parent {
+    margin-left: -1px;
+}
 .request-headers-view .outline-disclosure .children li {
     white-space: nowrap;
 }
@@ -91,3 +94,11 @@
     margin-right: 3px;
     vertical-align: middle;
 }
+
+.request-headers-view .section {
+    margin-left: -16px;
+}
+
+.request-headers-view .section.expanded .properties {
+    -webkit-padding-start: 0;
+}