[roll] Roll chromium version:73.0.3642.0

Test: CQ

Change-Id: I73309f3c184d07994286d5ceec5cd7e7b9a71419
diff --git a/tools/cipd.ensure b/tools/cipd.ensure
index 7c8fb1b..5c2db06 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 n6dfMegd3NIKCJSUKaVYG3lXVoYyPl6AHHUQO5s17hUC
+chromium/fuchsia/webrunner-amd64 37BLKIae6CtgixhaJQL-JzZ-lkO3ZwboNBzhyRMactMC
 
 # Chromium arm64 / aarch64 implementation
 @Subdir third_party/chromium/arch/arm64
-chromium/fuchsia/webrunner-arm64 6kl32oTtCU2003QWSldGCEKRQ_vpkg98MH_Wp9AER0AC
+chromium/fuchsia/webrunner-arm64 5iudKCvMQ-50glpHUwq1eUI8KbRfEGfLdAI5NxDuNqwC