Remove tracing browser test from base::Callback allowlist

File removed from allowlist does not seem to have occurrences of neither
base::Callback nor base::Bind

Bug: 1007635
Change-Id: I89d65021176a4182fa7dccf2eb79e5e3093c0f96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435387
Auto-Submit: Andrew Shulaev <ddrone@google.com>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#811458}

PRESUBMIT.py

@@ -373,7 +373,6 @@ _NOT_CONVERTED_TO_MODERN_BIND_AND_CALLBACK = '|'.join((
   '^chrome/browser/sync/',
   '^chrome/browser/themes/theme_service.cc',
   '^chrome/browser/thumbnail/cc/',
-  '^chrome/browser/tracing/chrome_tracing_delegate_browsertest.cc',
   '^chrome/browser/translate/',
   '^chrome/browser/ui/',
   '^chrome/browser/web_applications/',