Sort headers when displaying them

Summary: It's easier to scan the same header value of multiple requests when it's in roughly the same place for each one.

Reviewed By: mweststrate

Differential Revision: D24885172

fbshipit-source-id: 7be02903d2f9f79c8ba618e57c74169392f6244b

desktop/plugins/network/RequestDetails.tsx

@@ -271,7 +271,9 @@ class HeaderInspector extends Component<
     );
 
     const rows: any = [];
-    computedHeaders.forEach((value: string, key: string) => {
+    Array.from(computedHeaders.entries())
+      .sort((a, b) => (a[0] < b[0] ? -1 : a[0] == b[0] ? 0 : 1))
+      .forEach(([key, value]) => {
         rows.push({
           columns: {
             key: {