Revert "Add a warning message about missing gcert at the end of the build"

This reverts commit b018b83664c33256b8fb1303c6db5b196d4331e5.

Reason for revert: Builds will start failing now since the gcert change is about to go in.

Change-Id: I81d36ce6bf4f7a9bc120b34d411f2cb4ec64e5eb
diff --git a/ui/build/config.go b/ui/build/config.go
index 6cac06f..01fe8fa 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -1205,21 +1205,6 @@
 	return "RBE_use_application_default_credentials", "true"
 }
 
-func (c *configImpl) IsGooglerEnvironment() bool {
-	cf := "ANDROID_BUILD_ENVIRONMENT_CONFIG"
-	if v, ok := c.environ.Get(cf); ok {
-		return v == "googler"
-	}
-	return false
-}
-
-func (c *configImpl) GoogleProdCredsExist() bool {
-	if _, err := exec.Command("/usr/bin/prodcertstatus", "--simple_output", "--nocheck_loas").Output(); err != nil {
-		return false
-	}
-	return true
-}
-
 func (c *configImpl) UseRemoteBuild() bool {
 	return c.UseGoma() || c.UseRBE()
 }
diff --git a/ui/build/rbe.go b/ui/build/rbe.go
index 78d37b4..8f9a699 100644
--- a/ui/build/rbe.go
+++ b/ui/build/rbe.go
@@ -119,7 +119,6 @@
 }
 
 func stopRBE(ctx Context, config Config) {
-	defer checkProdCreds(ctx, config)
 	cmd := Command(ctx, config, "stopRBE bootstrap", rbeCommand(ctx, config, bootstrapCmd), "-shutdown")
 	output, err := cmd.CombinedOutput()
 	if err != nil {
@@ -132,15 +131,6 @@
 	}
 }
 
-func checkProdCreds(ctx Context, config Config) {
-	if !config.IsGooglerEnvironment() || config.GoogleProdCredsExist() {
-		return
-	}
-	fmt.Fprintln(ctx.Writer, "")
-	fmt.Fprintln(ctx.Writer, "\033[33mWARNING: Missing LOAS credentials, please run `gcert`. This will result in failing RBE builds in the future, see go/build-fast#authentication.\033[0m")
-	fmt.Fprintln(ctx.Writer, "")
-}
-
 // DumpRBEMetrics creates a metrics protobuf file containing RBE related metrics.
 // The protobuf file is created if RBE is enabled and the proxy service has
 // started. The proxy service is shutdown in order to dump the RBE metrics to the