Enable --build-v8-with-gn for Node.js bots.

Bug: v8:6105
Change-Id: Idfc10bdab9c69d2d5f751197e3df068406bd521a
Reviewed-on: https://chromium-review.googlesource.com/868131
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50638}

tools/node/fetch_deps.py

@@ -61,12 +61,6 @@ def EnsureGit(v8_path):
   return True
 
 def FetchDeps(v8_path):
-  # TODO(v8:6105):
-  # The return value gates whether Node's configure script actually
-  # uses GN. Change this to true once everything is ready so that
-  # the change to enable the GN build on the bots comes from V8.
-  return False;
-
   # Verify path.
   v8_path = os.path.abspath(v8_path)
   assert os.path.isdir(v8_path)
@@ -94,6 +88,8 @@ def FetchDeps(v8_path):
         os.path.join(v8_path, os.pardir, ".gclient_entries"))
     if os.path.isfile(gclient_entries):
       os.remove(gclient_entries)
+  # Enable building with GN for configure script.
+  return True
 
 
 if __name__ == "__main__":