generate_gradle: update invocation of list_java_targets.py

In http://crrev.com/833775 a command line flag was renamed in
list_java_targets.py. Update generate_gradle.py accordingly.

Bug: None
Change-Id: I91c85063f5eb1ae442731536103492c2fe15ff7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575018
Commit-Queue: Egor Pasko <pasko@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Egor Pasko <pasko@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833818}

build/android/gradle/generate_gradle.py

@@ -129,7 +129,7 @@ def _RunNinja(output_dir, args):
 def _QueryForAllGnTargets(output_dir):
   cmd = [
       os.path.join(_BUILD_ANDROID, 'list_java_targets.py'), '--gn-labels',
-      '--nested', '--build-build-configs', '--output-directory', output_dir
+      '--nested', '--build', '--output-directory', output_dir
   ]
   logging.info('Running: %r', cmd)
   return subprocess.check_output(cmd).splitlines()