Remove ModuleBase.prefer32.

It became obsolte by If96cccbd82ba1311165d61c947c928c6e7cd5593 and
Iaaac16ae171c06d90d04d7cac11789d3f39b8d99

Test: TreeHugger
Change-Id: Ifc8f28663b480ef5aff93a54040339ef080072c9

android/arch.go

@@ -616,16 +616,8 @@ func archMutator(bpctx blueprint.BottomUpMutatorContext) {
 		osTargets = []Target{osTargets[0]}
 	}
 
-	// Some modules want compile_multilib: "first" to mean 32-bit, not 64-bit.
-	// This is used for HOST_PREFER_32_BIT=true support for Art modules.
-	prefer32 := false
-	if base.prefer32 != nil {
-		prefer32 = base.prefer32(mctx, base, os)
-	}
-	if os == Windows {
 	// Windows builds always prefer 32-bit
-		prefer32 = true
-	}
+	prefer32 := os == Windows
 
 	// Determine the multilib selection for this module.
 	multilib, extraMultilib := decodeMultilib(base, os.Class)

android/module.go

@@ -1149,8 +1149,6 @@ type ModuleBase struct {
 
 	initRcPaths         Paths
 	vintfFragmentsPaths Paths
-
-	prefer32 func(ctx BaseModuleContext, base *ModuleBase, os OsType) bool
 }
 
 func (m *ModuleBase) ComponentDepsMutator(BottomUpMutatorContext) {}
@@ -1177,10 +1175,6 @@ func (m *ModuleBase) VariablesForTests() map[string]string {
 	return m.variables
 }
 
-func (m *ModuleBase) Prefer32(prefer32 func(ctx BaseModuleContext, base *ModuleBase, os OsType) bool) {
-	m.prefer32 = prefer32
-}
-
 // Name returns the name of the module.  It may be overridden by individual module types, for
 // example prebuilts will prepend prebuilt_ to the name.
 func (m *ModuleBase) Name() string {