Remove Platform.HasAmsi query

src/System.Management.Automation/CoreCLR/CorePsPlatform.cs

@@ -217,12 +217,6 @@ namespace System.Management.Automation
 
         }
 
-        // The Antimalware Scan Interface is not supported on Linux
-        internal static bool HasAmsi()
-        {
-            return IsWindows;
-        }
-
         // This is mainly with respect to the auto-mounting of
         // disconnected network drives on Windows
         internal static bool HasDriveAutoMounting()

src/System.Management.Automation/security/SecuritySupport.cs

@@ -1633,14 +1633,11 @@ namespace System.Management.Automation
         /// <returns>AMSI_RESULT_DETECTED if malware was detected in the sample.</returns>
         internal static AmsiNativeMethods.AMSI_RESULT ScanContent(string content, string sourceMetadata)
         {
-            if (Platform.HasAmsi())
-            {
-                return WinScanContent(content,sourceMetadata);
-            }
-            else
-            {
-                return AmsiNativeMethods.AMSI_RESULT.AMSI_RESULT_NOT_DETECTED;
-            }
+#if LINUX
+            return AmsiNativeMethods.AMSI_RESULT.AMSI_RESULT_NOT_DETECTED;
+#else
+            return WinScanContent(content,sourceMetadata);
+#endif
         }
 
         internal static AmsiNativeMethods.AMSI_RESULT WinScanContent(string content, string sourceMetadata)
@@ -1730,14 +1727,9 @@ namespace System.Management.Automation
 
         internal static void CurrentDomain_ProcessExit(object sender, EventArgs e)
         {
-            if (Platform.HasAmsi())
-            {
-                VerifyAmsiUninitializeCalled();
-            }
-            else
-            {
-                throw new PlatformNotSupportedException();
-            }
+#if !LINUX
+            VerifyAmsiUninitializeCalled();
+#endif
         }
 
         [SuppressMessage("Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources")]
@@ -1753,16 +1745,9 @@ namespace System.Management.Automation
         /// </summary>
         internal static void CloseSession()
         {
-            if (Platform.HasAmsi())
-            {
-                WinCloseSession();
-            }
-            else
-            {
-                // Porting note: cannot throw here because this is called whether or not
-                // AMSI was initialized in the first place
-                return;
-            }
+#if !LINUX
+            WinCloseSession();
+#endif
         }
 
         internal static void WinCloseSession()
@@ -1789,16 +1774,9 @@ namespace System.Management.Automation
         /// </summary>
         internal static void Uninitialize()
         {
-            if (Platform.HasAmsi())
-            {
-                WinUninitialize();
-            }
-            else
-            {
-                // Porting note: cannot throw here because this is called whether or not
-                // AMSI was initialized in the first place
-                return;
-            }
+#if !LINUX
+            WinUninitialize();
+#endif
         }
 
         internal static void WinUninitialize()

test/csharp/test_CorePsPlatform.cs

@@ -15,12 +15,6 @@ namespace PSTests
             Assert.True(Platform.IsCore);
         }
 
-        [Fact]
-        public static void TestHasAmsi()
-        {
-            Assert.False(Platform.HasAmsi());
-        }
-
         [Fact]
         public static void TestHasDriveAutoMounting()
         {