[roll] Roll chromium version:73.0.3643.0

Test: CQ

Change-Id: I21d021a45bcb78f41fdd0dbf9673c7856930e4f5
diff --git a/tools/cipd.ensure b/tools/cipd.ensure
index 5c2db06..c29f47e 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 37BLKIae6CtgixhaJQL-JzZ-lkO3ZwboNBzhyRMactMC
+chromium/fuchsia/webrunner-amd64 mrX5PX2cPsshfes0I5m6uEDWJLvZouc2tPu9vd49LHgC
 
 # Chromium arm64 / aarch64 implementation
 @Subdir third_party/chromium/arch/arm64
-chromium/fuchsia/webrunner-arm64 5iudKCvMQ-50glpHUwq1eUI8KbRfEGfLdAI5NxDuNqwC
+chromium/fuchsia/webrunner-arm64 PT34r0EKrqPNW-imBOpDOYlRcexyk3j3908SJPzQ3y8C