Remove redundant setting of DistFiles by java.Library

A previous change handles dist properties automatically for all module
types and as a result has made the java.Library setting of DistFiles
redundant so this change removes that and the tests that duplicate
tests of the general mechanism.

Test: m nothing
      m dist sdk - before and after this change, compare result to
      make sure that there are no significant differences.
Bug: 174226317
Change-Id: Ib79a3bdd46897efd84a9c456c37c374bd6036303

java/java.go

@@ -456,8 +456,6 @@ type Module struct {
 	// list of the xref extraction files
 	kytheFiles android.Paths
 
-	distFiles android.TaggedDistFiles
-
 	// Collect the module directory for IDE info in java/jdeps.go.
 	modulePaths []string
 
@@ -2114,8 +2112,6 @@ func (j *Library) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	if lib := proptools.String(j.usesLibraryProperties.Provides_uses_lib); lib != "" {
 		j.classLoaderContexts.AddContext(ctx, lib, j.DexJarBuildPath(), j.DexJarInstallPath())
 	}
-
-	j.distFiles = j.GenerateTaggedDistFiles(ctx)
 }
 
 func (j *Library) DepsMutator(ctx android.BottomUpMutatorContext) {