trybot_commit_size_checker.py: Show resource_sizes.py diff inline

* Removes obsolete command-line flags.
* Moves resource_sizes.py diff as well as failing size checks inline

Bug: 914654
Change-Id: I444da444a2bbed4a154ce1d4a64bb99549e81e86
Reviewed-on: https://chromium-review.googlesource.com/c/1407375
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622156}
2 files changed