Have ConvertWBp2build use Bp2buildMutatorContext

This no-op refactoring facilitates some upcoming functional changes for
"bp2build allowlist v2". The work requires that the bp2build conversion
mutator be changed from a TopDown mutator to a BottomUp mutator.
Refactoring all bp2build-related methods so that they use Bp2buildMutatorContext
makes it easier to make this functional change without touching tens of
files and multiple projects.

Bug: 285631638
Test: m bp2build
Change-Id: I3d1ef3064146e959c6f0dc315350fc9764bf2bd2
diff --git a/java/plugin.go b/java/plugin.go
index 5127298..4d4c199 100644
--- a/java/plugin.go
+++ b/java/plugin.go
@@ -64,7 +64,7 @@
 }
 
 // ConvertWithBp2build is used to convert android_app to Bazel.
-func (p *Plugin) ConvertWithBp2build(ctx android.TopDownMutatorContext) {
+func (p *Plugin) ConvertWithBp2build(ctx android.Bp2buildMutatorContext) {
 	pluginName := p.Name()
 	commonAttrs, bp2BuildInfo, supported := p.convertLibraryAttrsBp2Build(ctx)
 	if !supported {