CodeGen: Fix compile error in crrev.com/c/2004358

Bug: 839389
Change-Id: Icc68359187a88ce497e8c6df546031e11bffea0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006443Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732715}

third_party/blink/renderer/bindings/scripts/bind_gen/path_manager.py

@@ -95,7 +95,7 @@ class PathManager(object):
             default_component = web_idl.Component("core")
             self._api_component = default_component
             self._impl_component = default_component
-        if len(components) == 1:
+        elif len(components) == 1:
             component = components[0]
             self._is_cross_components = False
             self._api_component = component