Revert OneByteString back to ISO Latin-1 instead of ASCII

runtime/vm/object_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 "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
@@ skipping 558 matching lines @@
   EXPECT_EQ(0xFF, four_str.CharAt(1));
   EXPECT_EQ('h', four_str.CharAt(2));
   EXPECT_EQ(0xFFFF, four_str.CharAt(3));
   EXPECT_EQ('a', four_str.CharAt(4));
   EXPECT_EQ(0xDBFF, four_str.CharAt(5));
   EXPECT_EQ(0xDFFF, four_str.CharAt(6));
   EXPECT_EQ('r', four_str.CharAt(7));
 
   // Create a 1-byte string from an array of 2-byte elements.
   {
-    const uint16_t char16[] = { 0x00, 0x1F, 0x7F };
+    const uint16_t char16[] = { 0x00, 0x7F, 0xFF };
     const String& str8 = String::Handle(String::New(char16, 3));
     EXPECT(str8.IsOneByteString());
     EXPECT(!str8.IsTwoByteString());
     EXPECT_EQ(0x00, str8.CharAt(0));
-    EXPECT_EQ(0x1F, str8.CharAt(1));
-    EXPECT_EQ(0x7F, str8.CharAt(2));
+    EXPECT_EQ(0x7F, str8.CharAt(1));
+    EXPECT_EQ(0xFF, str8.CharAt(2));
   }
 
   // Create a 1-byte string from an array of 4-byte elements.
   {
     const uint32_t char32[] = { 0x00, 0x1F, 0x7F };
     const String& str8 = String::Handle(String::New(char32, 3));
     EXPECT(str8.IsOneByteString());
     EXPECT(!str8.IsTwoByteString());
     EXPECT_EQ(0x00, str8.CharAt(0));
     EXPECT_EQ(0x1F, str8.CharAt(1));
@@ skipping 2435 matching lines @@
   isolate->heap()->CollectAllGarbage();
   EXPECT(weak1.key() == Object::null());
   EXPECT(weak1.value() == Object::null());
   EXPECT(weak2.key() == Object::null());
   EXPECT(weak2.value() == Object::null());
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart