Tracing macro cleanup continued

- Remove one especially chatty event, and one pointless test
- Use TRACE_FUNC everywhere, rather than manual strings

Bug: skia:
Change-Id: Icb795294009150ca9a260436738d79546a733337
Reviewed-on: https://skia-review.googlesource.com/26701
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
10 files changed