[roll] Roll chromium version:73.0.3638.0

Test: CQ

Change-Id: Icb8e1acdffecca62cb0c866f570b4b10414aff65
diff --git a/tools/cipd.ensure b/tools/cipd.ensure
index a2e33a7..b3d7a16 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 cFsywgy42pgwgOdqGzNunww3m2Wky_kma8GTPiwpPScC
+chromium/fuchsia/webrunner-amd64 riIDpiT7xAFNBvAwn_QYoPtiSTP80gFSSUtklRPDPysC
 
 # Chromium arm64 / aarch64 implementation
 @Subdir third_party/chromium/arch/arm64
-chromium/fuchsia/webrunner-arm64 dPI3ihprreNKCF9c7G02wl_j4dvdF4gkzslaOk7aev0C
+chromium/fuchsia/webrunner-arm64 36sX9dnErV2SAQCaP4YFirf8FGmo57QPULKRhiJkO2kC