Revert OneByteString back to ISO Latin-1 instead of ASCII

runtime/vm/dart_api_impl_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "platform/utils.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
@@ skipping 500 matching lines @@
   }
 }
 
 
 TEST_CASE(IsString) {
   uint8_t data8[] = { 'o', 'n', 'e', 0x7F };
 
   Dart_Handle str8 = Dart_NewStringFromUTF8(data8, ARRAY_SIZE(data8));
   EXPECT_VALID(str8);
   EXPECT(Dart_IsString(str8));
-  EXPECT(Dart_IsAsciiString(str8));
+  EXPECT(Dart_IsISOLatin1String(str8));
   EXPECT(!Dart_IsExternalString(str8));
 
   Dart_Handle ext8 = Dart_NewExternalUTF8String(data8, ARRAY_SIZE(data8),
                                                 NULL, NULL);
   EXPECT_VALID(ext8);
   EXPECT(Dart_IsString(ext8));
   EXPECT(Dart_IsExternalString(ext8));
 
   uint16_t data16[] = { 't', 'w', 'o', 0xFFFF };
 
   Dart_Handle str16 = Dart_NewStringFromUTF16(data16, ARRAY_SIZE(data16));
   EXPECT_VALID(str16);
   EXPECT(Dart_IsString(str16));
-  EXPECT(!Dart_IsAsciiString(str16));
+  EXPECT(!Dart_IsISOLatin1String(str16));
   EXPECT(!Dart_IsExternalString(str16));
 
   Dart_Handle ext16 = Dart_NewExternalUTF16String(data16, ARRAY_SIZE(data16),
                                                   NULL, NULL);
   EXPECT_VALID(ext16);
   EXPECT(Dart_IsString(ext16));
   EXPECT(Dart_IsExternalString(ext16));
 
   uint32_t data32[] = { 'f', 'o', 'u', 'r', 0x10FFFF };
 
@@ skipping 6612 matching lines @@
     EXPECT(o2 == reinterpret_cast<void*>(&p2));
   }
   Dart_ExitScope();
   isolate->heap()->CollectGarbage(Heap::kOld);
   EXPECT_EQ(0, isolate->heap()->PeerCount());
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart