Remove unused args from generate_official_build_report.py

Now that recipe doesn't pass them.

Change-Id: Ic8bc5b929bbb08564f81c04a3b35b00ccc550e2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1987026Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728563}

tools/binary_size/generate_official_build_report.py

@@ -78,9 +78,6 @@ def main():
       help='Path to .size file for the given version.')
   parser.add_argument(
       '--arch', required=True, help='Compiler architecture of build.')
-  parser.add_argument('--gs-size-url', help='Unused')
-  parser.add_argument('--gs-size-path', help='Unused')
-  parser.add_argument('--platform', help='Unused')
 
   args = parser.parse_args()