Switch cc_test host_supported: true to unit tests

Test: presubmit
Bug: 179092189
Change-Id: Ic5c3ca6de44732f6299ad9a35d1aaef622f3ff7f
diff --git a/cc/test.go b/cc/test.go
index 17ac534..68e05ba 100644
--- a/cc/test.go
+++ b/cc/test.go
@@ -232,7 +232,6 @@
 type testDecorator struct {
 	Properties TestProperties
 	linker     *baseLinker
-	hod        android.HostOrDeviceSupported
 }
 
 func (test *testDecorator) gtest() bool {
@@ -432,8 +431,7 @@
 		ctx.PropertyErrorf("no_named_install_directory", "Module install directory may only be disabled if relative_install_path is set")
 	}
 
-	// TODO(179092189): Clean up to use Ctx.Host() when generalizing to cc_test
-	if test.testDecorator.hod == android.HostSupported && test.gtest() && test.Properties.Test_options.Unit_test == nil {
+	if ctx.Host() && test.gtest() && test.Properties.Test_options.Unit_test == nil {
 		test.Properties.Test_options.Unit_test = proptools.BoolPtr(true)
 	}
 	test.binaryDecorator.baseInstaller.install(ctx, file)
@@ -447,7 +445,6 @@
 	test := &testBinary{
 		testDecorator: testDecorator{
 			linker: binary.baseLinker,
-			hod:    hod,
 		},
 		binaryDecorator: binary,
 		baseCompiler:    NewBaseCompiler(),