Simplify deapexer support

Uses the apex relative path to the file as the identifier that is used
to obtain the path to the corresponding file extracted from the apex.
That is instead of a special constructed string id.

Bug: 177892522
Test: m nothing
Change-Id: I5dc77c8fb272bac289b8891d1eac801e541af1f5
diff --git a/java/sdk_library.go b/java/sdk_library.go
index 8bb7e0f..41097ca 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -2144,7 +2144,7 @@
 
 			// Get the path of the dex implementation jar from the `deapexer` module.
 			di := ctx.OtherModuleProvider(deapexerModule, android.DeapexerProvider).(android.DeapexerInfo)
-			if dexOutputPath := di.PrebuiltExportPath(module.BaseModuleName(), ".dexjar"); dexOutputPath != nil {
+			if dexOutputPath := di.PrebuiltExportPath(apexRootRelativePathToJavaLib(module.BaseModuleName())); dexOutputPath != nil {
 				module.dexJarFile = dexOutputPath
 				module.initHiddenAPI(ctx, dexOutputPath, module.findScopePaths(apiScopePublic).stubsImplPath[0], nil)
 			} else {
@@ -2271,7 +2271,7 @@
 
 var _ android.RequiredFilesFromPrebuiltApex = (*SdkLibraryImport)(nil)
 
-func (module *SdkLibraryImport) RequiredFilesFromPrebuiltApex(ctx android.BaseModuleContext) map[string]string {
+func (module *SdkLibraryImport) RequiredFilesFromPrebuiltApex(ctx android.BaseModuleContext) []string {
 	name := module.BaseModuleName()
 	return requiredFilesFromPrebuiltApexForImport(name)
 }