Change IllegalArgumentException to ArgumentError.

runtime/lib/double.cc

Index: runtime/lib/double.cc
diff --git a/runtime/lib/double.cc b/runtime/lib/double.cc
index 6a1304dd086379c727a29ec22c4bb2b0cdb4c970..b60644b63704317ee1db0ef853d51cb470e944d0 100644
--- a/runtime/lib/double.cc
+++ b/runtime/lib/double.cc
@@ -188,7 +188,7 @@ DEFINE_NATIVE_ENTRY(Double_toStringAsFixed, 2) {
     GrowableArray<const Object*> args;
     args.Add(&String::ZoneHandle(String::New(
         "Illegal arguments to double.toStringAsFixed")));
-    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
+    Exceptions::ThrowByType(Exceptions::kArgument, args);
     return Object::null();
   }
 }
@@ -206,7 +206,7 @@ DEFINE_NATIVE_ENTRY(Double_toStringAsExponential, 2) {
     GrowableArray<const Object*> args;
     args.Add(&String::ZoneHandle(String::New(
         "Illegal arguments to double.toStringAsExponential")));
-    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
+    Exceptions::ThrowByType(Exceptions::kArgument, args);
     return Object::null();
   }
 }
@@ -223,7 +223,7 @@ DEFINE_NATIVE_ENTRY(Double_toStringAsPrecision, 2) {
     GrowableArray<const Object*> args;
     args.Add(&String::ZoneHandle(String::New(
         "Illegal arguments to double.toStringAsPrecision")));
-    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
+    Exceptions::ThrowByType(Exceptions::kArgument, args);
     return Object::null();
   }
 }