[roll] Roll chromium version:73.0.3632.0

Test: CQ

Change-Id: I78b335314736aa0777852c54c3cf5c08a214b9a8
diff --git a/tools/cipd.ensure b/tools/cipd.ensure
index 5f932fc..3fdd584 100644
--- a/tools/cipd.ensure
+++ b/tools/cipd.ensure
@@ -10,8 +10,8 @@
 
 # Chromium amd64 / x64 implementation
 @Subdir third_party/chromium/arch/x64
-chromium/fuchsia/webrunner-amd64 4NpUnKe9DLBZfzBakLwH5ytBPRRQHuohfmKOUm9d4M8C
+chromium/fuchsia/webrunner-amd64 iaBfj2ujmgakVIVV_64VqCHyH7qxqk7u2qXfXaBfNBAC
 
 # Chromium arm64 / aarch64 implementation
 @Subdir third_party/chromium/arch/arm64
-chromium/fuchsia/webrunner-arm64 02HmUBz_ijz27sDoztSc2gt47gKz-Ia4t1AEGLckqEEC
+chromium/fuchsia/webrunner-arm64 l1-ODTGKd3sO7ZhX5EOSE147ghtvUphlXMeicX_I_xkC