Revert "Add os parameter to composd_cmd"

This reverts commit 4dda2fb53ee669c711d19d3f60de9570f56ad245.

Reason for revert: Likely culprit for b/381204036  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: I4cc3ecc7a7f0a51e82574a4c700b2d2bf4ea0d0d
diff --git a/android/composd/src/instance_manager.rs b/android/composd/src/instance_manager.rs
index cb1f7e4..9e94035 100644
--- a/android/composd/src/instance_manager.rs
+++ b/android/composd/src/instance_manager.rs
@@ -46,12 +46,11 @@
         self.start_instance(CURRENT_INSTANCE_DIR, vm_parameters)
     }
 
-    pub fn start_test_instance(&self, prefer_staged: bool, os: &str) -> Result<CompOsInstance> {
+    pub fn start_test_instance(&self, prefer_staged: bool) -> Result<CompOsInstance> {
         let mut vm_parameters = new_vm_parameters()?;
         vm_parameters.name = String::from("ComposdTest");
         vm_parameters.debug_mode = true;
         vm_parameters.prefer_staged = prefer_staged;
-        vm_parameters.os = os.to_owned();
         self.start_instance(TEST_INSTANCE_DIR, vm_parameters)
     }
 
diff --git a/android/composd/src/service.rs b/android/composd/src/service.rs
index 3cc40af..49cfd3a 100644
--- a/android/composd/src/service.rs
+++ b/android/composd/src/service.rs
@@ -60,7 +60,6 @@
         &self,
         apex_source: ApexSource,
         callback: &Strong<dyn ICompilationTaskCallback>,
-        os: &str,
     ) -> binder::Result<Strong<dyn ICompilationTask>> {
         check_permissions()?;
         let prefer_staged = match apex_source {
@@ -68,7 +67,7 @@
             ApexSource::PreferStaged => true,
             _ => unreachable!("Invalid ApexSource {:?}", apex_source),
         };
-        to_binder_result(self.do_start_test_compile(prefer_staged, callback, os))
+        to_binder_result(self.do_start_test_compile(prefer_staged, callback))
     }
 }
 
@@ -94,12 +93,9 @@
         &self,
         prefer_staged: bool,
         callback: &Strong<dyn ICompilationTaskCallback>,
-        os: &str,
     ) -> Result<Strong<dyn ICompilationTask>> {
-        let comp_os = self
-            .instance_manager
-            .start_test_instance(prefer_staged, os)
-            .context("Starting CompOS")?;
+        let comp_os =
+            self.instance_manager.start_test_instance(prefer_staged).context("Starting CompOS")?;
 
         let target_dir_name = TEST_ARTIFACTS_SUBDIR.to_owned();
         let task = OdrefreshTask::start(