Top-level pages should show left-navigation.

chrome/common/extensions/docs/templates/json/chrome_sidenav.json

Index: chrome/common/extensions/docs/templates/json/chrome_sidenav.json
diff --git a/chrome/common/extensions/docs/templates/json/chrome_sidenav.json b/chrome/common/extensions/docs/templates/json/chrome_sidenav.json
index f67f7d6b9705511b524b1079481439d189cfad29..e4f5f08658bde6ca39c45fef88b1e96da7206079 100644
--- a/chrome/common/extensions/docs/templates/json/chrome_sidenav.json
+++ b/chrome/common/extensions/docs/templates/json/chrome_sidenav.json
@@ -405,6 +405,10 @@
                 "href": "/apps/cloudMessaging"
               },
               {
+                "title": "Native Messaging",
+                "href": "/apps/nativeMessaging"
+              },  
+              {
                 "title": "Rich Notifications",
                 "href": "/apps/richNotifications"
               },
@@ -528,11 +532,11 @@
       },
       {
         "title": "Extensions",
-        "href": "/extensions/overview",
+        "href": "/extensions/index",
         "items": [
           {
             "title": "Learn Basics",
-            "href": "/extensions/overview",
+            "href": "/extensions/index",
             "items": [
               {
                 "title": "Overview",
@@ -602,6 +606,10 @@
                 "href": "/extensions/messaging"
               },
               {
+                "title": "Native Messaging",
+                "href": "/extensions/nativeMessaging"
+              },
+              {
                 "title": "Migrate to Manifest 2",
                 "href": "/extensions/tut_migration_to_manifest_v2"
               },
@@ -697,11 +705,11 @@
       },
       {
         "title": "Native Client",
-        "href": "/native-client/overview",
+        "href": "/native-client/index",
         "items": [
           {
             "title": "Learn Basics",
-            "href": "/native-client/overview",
+            "href": "/native-client/index",
             "items": [
               {
                 "title": "Technical Overview",