Resolve C++11 narrowing conversion errors when compiling with GCC 4.7.

runtime/vm/snapshot_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_debugger_api.h"
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_message.h"
@@ skipping 510 matching lines @@
   Dart_CObject* root = api_reader.ReadMessage();
   EXPECT_EQ(Dart_CObject::kString, root->type);
   EXPECT_STREQ(cstr, root->value.as_string);
   CheckEncodeDecodeMessage(root);
 }
 
 
 TEST_CASE(SerializeString) {
   TestString("This string shall be serialized");
   TestString("æøå");  // This file is UTF-8 encoded.
-  char data[] = {0x01,
-                 0x7f,
-                 0xc2, 0x80,         // 0x80
-                 0xdf, 0xbf,         // 0x7ff
-                 0xe0, 0xa0, 0x80,   // 0x800
-                 0xef, 0xbf, 0xbf,   // 0xffff
-                 0x00};              // String termination.
+  const char* data = "\x01"
+                     "\x7F"
+                     "\xC2\x80"       // U+0080
+                     "\xDF\xBF"       // U+07FF
+                     "\xE0\xA0\x80"   // U+0800
+                     "\xEF\xBF\xBF";  // U+FFFF
+
   TestString(data);
   // TODO(sgjesse): Add tests with non-BMP characters.
 }
 
 
 TEST_CASE(SerializeArray) {
   StackZone zone(Isolate::Current());
 
   // Write snapshot with object content.
   uint8_t* buffer;
@@ skipping 1552 matching lines @@
 
   object.type = Dart_CObject::kString;
   object.value.as_string = const_cast<char*>("456");
   EXPECT(Dart_PostCObject(send_port_id, &object));
 
   object.type = Dart_CObject::kString;
   object.value.as_string = const_cast<char*>("æøå");
   EXPECT(Dart_PostCObject(send_port_id, &object));
 
   // Try to post an invalid UTF-8 sequence (lead surrogate).
-  char data[] = {0xed, 0xa0, 0x80, 0};  // 0xd800
+  const char* data = "\xED\xA0\x80";  // U+D800
   object.type = Dart_CObject::kString;
   object.value.as_string = const_cast<char*>(data);
   EXPECT(!Dart_PostCObject(send_port_id, &object));
 
   object.type = Dart_CObject::kDouble;
   object.value.as_double = 3.14;
   EXPECT(Dart_PostCObject(send_port_id, &object));
 
   object.type = Dart_CObject::kArray;
   object.value.as_array.length = 0;
@@ skipping 23 matching lines @@
   EXPECT(Dart_ErrorHasException(result));
   EXPECT_SUBSTRING("Exception: nulltruefalse123456æøå3.14[]100123456789\n",
                    Dart_GetError(result));
 
   Dart_ExitScope();
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart