Reformat sdk/ using the new style.

There should be no actual code changes here, just formatting.

Change-Id: Id7356fdd9a0963ec0965b92e5ca1b218085f162e
CoreLibraryReviewExempt: No behavioral changes
Tested: No meaningful changes, ran on bots
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/394000
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Commit-Queue: Bob Nystrom <rnystrom@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>

https://dart.googlesource.com/sdk/+/73117f0576ff6a633b5b1b58b674514de3e6b964

DEPS

diff --git a/DEPS b/DEPS
index ccbca35..f579a02 100644
--- a/DEPS
+++ b/DEPS
@@ -260,7 +260,7 @@
 
   'engine/src/flutter': Var('flutter_git') + '/mirrors/engine' + '@' + 'a08bd5a07c2ac8e160e286c5841f47fa801e823b',
 
-  'engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '76feb10829e305ce7953432e735d4f05469d4268',
+  'engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '73117f0576ff6a633b5b1b58b674514de3e6b964',
 
   'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + 'c8510f29ccc2cefaf1337a7ba81192e34dd87b32',
 

commits.json

diff --git a/commits.json b/commits.json
index 181df67..6a2e206 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "engine/src/flutter":"a08bd5a07c2ac8e160e286c5841f47fa801e823b",
-  "engine/src/flutter/third_party/dart":"76feb10829e305ce7953432e735d4f05469d4268",
+  "engine/src/flutter/third_party/dart":"73117f0576ff6a633b5b1b58b674514de3e6b964",
   "flutter":"c8510f29ccc2cefaf1337a7ba81192e34dd87b32"
 }
\ No newline at end of file