disable bazel by default

Test: m nothing, verified bp2build was not run
Test: presubmits
Change-Id: I7476194f8424fa4f199fb94e1cbd0b3c84339fd9

ui/build/config.go

@@ -205,19 +205,6 @@ func loadEnvConfig(ctx Context, config *configImpl, bc string) error {
 	return nil
 }
 
-func defaultBazelProdMode(cfg *configImpl) bool {
-	// Environment flag to disable Bazel for users which experience
-	// broken bazel-handled builds, or significant performance regressions.
-	if cfg.IsBazelMixedBuildForceDisabled() {
-		return false
-	}
-	// Darwin-host builds are currently untested with Bazel.
-	if runtime.GOOS == "darwin" {
-		return false
-	}
-	return true
-}
-
 func UploadOnlyConfig(ctx Context, args ...string) Config {
 	ret := &configImpl{
 		environ:       OsEnvironment(),
@@ -892,9 +879,6 @@ func (c *configImpl) parseArgs(ctx Context, args []string) {
 			c.arguments = append(c.arguments, arg)
 		}
 	}
-	if (!c.bazelProdMode) && (!c.bazelStagingMode) {
-		c.bazelProdMode = defaultBazelProdMode(c)
-	}
 }
 
 func validateNinjaWeightList(weightListFilePath string) (err error) {