VM: Make more globals constant where easily possible.

runtime/bin/vmservice_impl.cc

 // Copyright (c) 2013, 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 "bin/vmservice_impl.h"
 
 #include "include/dart_api.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
@@ skipping 13 matching lines @@
 
 #define SHUTDOWN_ON_ERROR(handle)                               \
   if (Dart_IsError(handle)) {                                   \
     error_msg_ = strdup(Dart_GetError(handle));                 \
     Dart_ExitScope();                                           \
     Dart_ShutdownIsolate();                                     \
     return false;                                               \
   }
 
 #define kLibrarySourceNamePrefix "/vmservice"
-static const char* kVMServiceIOLibraryUri = "dart:vmservice_io";
-static const char* kVMServiceIOLibraryScriptResourceName = "vmservice_io.dart";
+static const char* const kVMServiceIOLibraryUri = "dart:vmservice_io";
+static const char* const kVMServiceIOLibraryScriptResourceName =
+    "vmservice_io.dart";
 
 struct ResourcesEntry {
   const char* path_;
   const char* resource_;
   int length_;
 };
 
 extern ResourcesEntry __service_bin_resources_[];
 
 class Resources {
@@ skipping 369 matching lines @@
   Dart_Handle source = GetSource(url_string);
   if (Dart_IsError(source)) {
     return source;
   }
   return Dart_LoadSource(library, url, source, 0, 0);
 }
 
 
 }  // namespace bin
 }  // namespace dart