Use the "main" branch for Dawn rolls.

Bug: dawn:555
Change-Id: Ie073fd788cd3c8a46551b05baabe72c4599b958e
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/328798
Auto-Submit: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
diff --git a/autoroll/config/dawn-chromium.json b/autoroll/config/dawn-chromium.json
index 55b59ff..69b3b44 100644
--- a/autoroll/config/dawn-chromium.json
+++ b/autoroll/config/dawn-chromium.json
@@ -41,7 +41,7 @@
   ],
   "supportsManualRolls": true,
   "noCheckoutDEPSRepoManager": {
-    "childBranch": "master",
+    "childBranch": "main",
     "childPath": "src/third_party/dawn",
     "childRepo": "https://dawn.googlesource.com/dawn.git",
     "childRevLinkTmpl": "https://dawn.googlesource.com/dawn.git/+show/%s",
diff --git a/autoroll/config/dawn-skia.json b/autoroll/config/dawn-skia.json
index 3e8a037..1a9f0a7 100644
--- a/autoroll/config/dawn-skia.json
+++ b/autoroll/config/dawn-skia.json
@@ -38,7 +38,7 @@
   ],
   "supportsManualRolls": true,
   "noCheckoutDEPSRepoManager": {
-    "childBranch": "master",
+    "childBranch": "main",
     "childPath": "third_party/externals/dawn",
     "childRepo": "https://dawn.googlesource.com/dawn.git",
     "childRevLinkTmpl": "https://dawn.googlesource.com/dawn.git/+show/%s",
diff --git a/autoroll/config/tint-dawn.json b/autoroll/config/tint-dawn.json
index 88abc09..1e64fd3 100644
--- a/autoroll/config/tint-dawn.json
+++ b/autoroll/config/tint-dawn.json
@@ -34,7 +34,7 @@
     "childPath": "third_party/tint",
     "childRepo": "https://dawn.googlesource.com/tint.git",
     "childRevLinkTmpl": "https://dawn.googlesource.com/tint.git/+show/%s",
-    "parentBranch": "master",
+    "parentBranch": "main",
     "parentRepo": "https://dawn.googlesource.com/dawn.git"
   },
   "kubernetes": {