java_sdk_library: Remove unused stubsLibraryDependencyTag

Bug: 145998881
Test: m checkbuild
Change-Id: I3ce0fa498c261a9a1f0382f6d548bb070a656358
diff --git a/java/sdk_library.go b/java/sdk_library.go
index a26474f..b204047 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -24,7 +24,6 @@
 	"strings"
 	"sync"
 
-	"github.com/google/blueprint"
 	"github.com/google/blueprint/proptools"
 )
 
@@ -54,11 +53,6 @@
 		`</permissions>\n`
 )
 
-type stubsLibraryDependencyTag struct {
-	blueprint.BaseDependencyTag
-	name string
-}
-
 var (
 	publicApiStubsTag = dependencyTag{name: "public"}
 	systemApiStubsTag = dependencyTag{name: "system"}