Revert "Prevent committing session while in progress"

This reverts commit 1138064218.

Reason for revert: b/259333954

Change-Id: I724ec379395237ff8f47c98815d0ea49b7417e5d

services/core/java/com/android/server/pm/PackageInstallerSession.java

@@ -366,14 +366,6 @@ public class PackageInstallerSession extends IPackageInstallerSession.Stub {
     @GuardedBy("mLock")
     private boolean mStageDirInUse = false;
 
-    /**
-     * True if the installation is already in progress. This is used to prevent the caller
-     * from {@link #commit(IntentSender, boolean) committing} the session again while the
-     * installation is still in progress.
-     */
-    @GuardedBy("mLock")
-    private boolean mInstallationInProgress = false;
-
     /** Permissions have been accepted by the user (see {@link #setPermissionsResult}) */
     @GuardedBy("mLock")
     private boolean mPermissionsManuallyAccepted = false;
@@ -1669,14 +1661,6 @@ public class PackageInstallerSession extends IPackageInstallerSession.Stub {
             }
         }
 
-        synchronized (mLock) {
-            if (mInstallationInProgress) {
-                throw new IllegalStateException("Installation is already in progress. Don't "
-                        + "commit session=" + sessionId + " again.");
-            }
-            mInstallationInProgress = true;
-        }
-
         dispatchSessionSealed();
     }