Change IllegalArgumentException to ArgumentError.

tests/standalone/io/process_invalid_arguments_test.dart

Index: tests/standalone/io/process_invalid_arguments_test.dart
diff --git a/tests/standalone/io/process_invalid_arguments_test.dart b/tests/standalone/io/process_invalid_arguments_test.dart
index dd1c87f3da1f98c6074f8d31146b91a3f9fc20ed..35385b44e802f0b7a31225a99fc770c48a3d7a19 100644
--- a/tests/standalone/io/process_invalid_arguments_test.dart
+++ b/tests/standalone/io/process_invalid_arguments_test.dart
@@ -8,29 +8,29 @@
 
 void main() {
   Expect.throws(() => Process.start(["true"], []),
-                (e) => e is IllegalArgumentException);
+                (e) => e is ArgumentError);
   Expect.throws(() => Process.start("true", "asdf"),
-                (e) => e is IllegalArgumentException);
+                (e) => e is ArgumentError);
   Expect.throws(() => Process.start("true", ["asdf", 1]),
-                (e) => e is IllegalArgumentException);
+                (e) => e is ArgumentError);
   Expect.throws(() => Process.run(["true"], [], null),
-                (e) => e is IllegalArgumentException);
+                (e) => e is ArgumentError);
   Expect.throws(() => Process.run("true", "asdf", null),
-                (e) => e is IllegalArgumentException);
+                (e) => e is ArgumentError);
   Expect.throws(() => Process.run("true", ["asdf", 1], null),
-                (e) => e is IllegalArgumentException);
+                (e) => e is ArgumentError);
   var options = new ProcessOptions();
   options.workingDirectory = 23;
   Expect.throws(() => Process.start("true", [], options),
-                (e) => e is IllegalArgumentException);
+                (e) => e is ArgumentError);
   Expect.throws(() => Process.run("true", [], options),
-                (e) => e is IllegalArgumentException);
+                (e) => e is ArgumentError);
   options = new ProcessOptions();
   options.stdoutEncoding = 23;
   Expect.throws(() => Process.run("true", [], options),
-                (e) => e is IllegalArgumentException);
+                (e) => e is ArgumentError);
   options = new ProcessOptions();
   options.stderrEncoding = 23;
   Expect.throws(() => Process.run("true", [], options),
-                (e) => e is IllegalArgumentException);
+                (e) => e is ArgumentError);
 }