[Extensions] Make chrome://extensions use developerPrivate for inspect

chrome/common/extensions/api/developer_private.idl

Index: chrome/common/extensions/api/developer_private.idl
diff --git a/chrome/common/extensions/api/developer_private.idl b/chrome/common/extensions/api/developer_private.idl
index 0d61886ebd28e569a167469621e41728217ec018..1a2ffae677462b936965e85cded40ad05e6659c6 100644
--- a/chrome/common/extensions/api/developer_private.idl
+++ b/chrome/common/extensions/api/developer_private.idl
@@ -68,10 +68,11 @@ namespace developerPrivate {
     ItemInspectView[] views;
   };
 
+  // TODO(devlin): Combine inspect and openDevTools?
   dictionary InspectOptions {
     DOMString extension_id;
-    DOMString render_process_id;
-    DOMString render_view_id;
+    (DOMString or long) render_process_id;
+    (DOMString or long) render_view_id;
     boolean incognito;
   };