Remove MutatorHandle.Parallel()

All mutators are parallel by default, remove the explicit Parallel()
calls.

Bug: 372540665
Test: all soong tests pass
Flag: EXEMPT refactor
Change-Id: I41e3a71bd13c75b7fceae91b1c4cfe678ab62df2
diff --git a/java/bootclasspath.go b/java/bootclasspath.go
index 029f6f6..3413cf3 100644
--- a/java/bootclasspath.go
+++ b/java/bootclasspath.go
@@ -29,7 +29,7 @@
 
 func registerBootclasspathBuildComponents(ctx android.RegistrationContext) {
 	ctx.FinalDepsMutators(func(ctx android.RegisterMutatorsContext) {
-		ctx.BottomUp("bootclasspath_deps", bootclasspathDepsMutator).Parallel()
+		ctx.BottomUp("bootclasspath_deps", bootclasspathDepsMutator)
 	})
 }
 
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 5c69ff1..fa6653f 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -465,7 +465,7 @@
 	ctx.RegisterParallelSingletonModuleType("dex_bootjars", dexpreoptBootJarsFactory)
 	ctx.RegisterModuleType("art_boot_images", artBootImagesFactory)
 	ctx.FinalDepsMutators(func(ctx android.RegisterMutatorsContext) {
-		ctx.BottomUp("dex_bootjars_deps", DexpreoptBootJarsMutator).Parallel()
+		ctx.BottomUp("dex_bootjars_deps", DexpreoptBootJarsMutator)
 	})
 }
 
diff --git a/java/java.go b/java/java.go
index 018850f..4a1f2d9 100644
--- a/java/java.go
+++ b/java/java.go
@@ -70,9 +70,9 @@
 	// established, to not get the dependencies split into the wrong variants and
 	// to support the checks in dexpreoptDisabled().
 	ctx.FinalDepsMutators(func(ctx android.RegisterMutatorsContext) {
-		ctx.BottomUp("dexpreopt_tool_deps", dexpreoptToolDepsMutator).Parallel()
+		ctx.BottomUp("dexpreopt_tool_deps", dexpreoptToolDepsMutator)
 		// needs access to ApexInfoProvider which is available after variant creation
-		ctx.BottomUp("jacoco_deps", jacocoDepsMutator).Parallel()
+		ctx.BottomUp("jacoco_deps", jacocoDepsMutator)
 	})
 
 	ctx.RegisterParallelSingletonType("kythe_java_extract", kytheExtractJavaFactory)