Refactor factories

Change module factories from returning a blueprint.Module and a list
of property structs to returning an android.Module, which holds the
list of property structs.

Test: build.ninja identical except for Factory: comment lines
Change-Id: Ica1d823f009db812c518f271a386fbff39c9766f
diff --git a/cc/binary.go b/cc/binary.go
index e982329..f6e62b7 100644
--- a/cc/binary.go
+++ b/cc/binary.go
@@ -17,7 +17,6 @@
 import (
 	"path/filepath"
 
-	"github.com/google/blueprint"
 	"github.com/google/blueprint/proptools"
 
 	"android/soong/android"
@@ -55,13 +54,13 @@
 }
 
 // Module factory for binaries
-func binaryFactory() (blueprint.Module, []interface{}) {
+func binaryFactory() android.Module {
 	module, _ := NewBinary(android.HostAndDeviceSupported)
 	return module.Init()
 }
 
 // Module factory for host binaries
-func binaryHostFactory() (blueprint.Module, []interface{}) {
+func binaryHostFactory() android.Module {
 	module, _ := NewBinary(android.HostSupported)
 	return module.Init()
 }