master => main

Change-Id: Ib5abdd36858828fde46ee3898489ffd1362e99b2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/213028
Reviewed-by: Alexander Thomas <athom@google.com>

CONTRIBUTING.md

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a508ebd..bf9f47d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -12,7 +12,7 @@
     * To report an API doc bug,
       [create an SDK issue](https://github.com/dart-lang/sdk/issues/new?title=API%20doc%20issue:).
   * Contribute to the Dart developer websites such as [dart.dev](https://dart.dev) (repo: [dart-lang/site-www](https://github.com/dart-lang/site-www)) and [dart.dev/web](https://dart.dev/web) (repo: [dart-lang/site-www/src/web](https://github.com/dart-lang/site-www/tree/master/src/web)). For more information, see [Writing for Dart and Flutter websites](https://github.com/dart-lang/site-shared/wiki/Writing-for-Dart-and-Flutter-websites).
-  * Improve the API reference docs at [api.dart.dev](https://api.dart.dev) by editing doc comments in the [Dart SDK repo](https://github.com/dart-lang/sdk/tree/master/sdk/lib). For more information on how to write API docs, see [Effective Dart: Documentation](https://dart.dev/guides/language/effective-dart/documentation).
+  * Improve the API reference docs at [api.dart.dev](https://api.dart.dev) by editing doc comments in the [Dart SDK repo](https://github.com/dart-lang/sdk/tree/main/sdk/lib). For more information on how to write API docs, see [Effective Dart: Documentation](https://dart.dev/guides/language/effective-dart/documentation).
 
 ## Before you contribute
 
@@ -41,10 +41,10 @@
 ...
 ```
 
-## Keeping your branch updated with origin/master
+## Keeping your branch updated with origin/main
 
 As you work, and before you send a patch for review, you should
-ensure your branch is merging cleanly to `origin/master`.
+ensure your branch is merging cleanly to `origin/main`.
 
 There are multiple ways to do this, but we generally recommend
 running:
@@ -56,7 +56,7 @@
 Note: you can run this command from any branch.
 
 This command will fetch
-origin/master, rebase all your open branches, and delete
+origin/main, rebase all your open branches, and delete
 cleanly merged branches.
 
 Your local workflow may vary.

README.md

diff --git a/README.md b/README.md
index 79cec90..a82e962 100644
--- a/README.md
+++ b/README.md
@@ -60,12 +60,12 @@
 You can also contribute patches, as described in [Contributing][contrib].
 
 [website]: https://dart.dev
-[license]: https://github.com/dart-lang/sdk/blob/master/LICENSE
+[license]: https://github.com/dart-lang/sdk/blob/main/LICENSE
 [repo]: https://github.com/dart-lang/sdk
 [lang]: https://dart.dev/guides/language/language-tour
 [tools]: https://dart.dev/tools
 [codelabs]: https://dart.dev/codelabs
 [dartbug]: http://dartbug.com
-[contrib]: https://github.com/dart-lang/sdk/blob/master/CONTRIBUTING.md
+[contrib]: https://github.com/dart-lang/sdk/blob/main/CONTRIBUTING.md
 [pubsite]: https://pub.dev
-[patent_grant]: https://github.com/dart-lang/sdk/blob/master/PATENT_GRANT
+[patent_grant]: https://github.com/dart-lang/sdk/blob/main/PATENT_GRANT