[roll] Roll chromium version:73.0.3636.0

Test: CQ

Change-Id: I53408fabe6e4dcfd5e2fa9912f73e0e8299a4e21
diff --git a/tools/cipd.ensure b/tools/cipd.ensure
index 2e613b0..784da6b 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 p9MuEAKYl5YP8K7yLacXLAgs2WvxeeQOJKi3wsFOtAkC
+chromium/fuchsia/webrunner-amd64 cZY8WtVsxbbPuQs90SNP9QqjPn5ragkXI9CIa8H0mQwC
 
 # Chromium arm64 / aarch64 implementation
 @Subdir third_party/chromium/arch/arm64
-chromium/fuchsia/webrunner-arm64 JTKoNWjdAcUanqr2qcI3hnrWiokzWBB7ZxGES457g6cC
+chromium/fuchsia/webrunner-arm64 7PHwbMpToWS_ebCvBN5AwG_lztNVOpT4k7Y_vmxKeEwC