Apply gn format with 'sources' sorting to src/

Application of https://codereview.chromium.org/962003002/.

TBR=keybuk@chromium.org
R=brettw@chromium.org
BUG=456014

Review URL: https://codereview.chromium.org/960413003

Cr-Original-Commit-Position: refs/heads/master@{#318574}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7c7296f4dcb7e32fa4440b333a40a37699f517b1
1 file changed
tree: c482b079f2ca26c33cabbf68846e1840007051af
  1. tools/