Some cleanups to observatory BUILD.gn

runtime/bin/main.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 <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
@@ skipping 1329 matching lines @@
   // Shutdown the isolate.
   Dart_ShutdownIsolate();
 
   // No restart.
   return false;
 }
 
 #undef CHECK_RESULT
 
 extern unsigned int observatory_assets_archive_len;
-extern const char* observatory_assets_archive;
+extern const uint8_t* const observatory_assets_archive;
 
 Dart_Handle GetVMServiceAssetsArchiveCallback() {
   return DartUtils::MakeUint8Array(
-      reinterpret_cast<const uint8_t*>(&observatory_assets_archive[0]),
+      observatory_assets_archive,
       observatory_assets_archive_len);
 }
 
 
 void main(int argc, char** argv) {
   char* script_name;
   const int EXTRA_VM_ARGUMENTS = 2;
   CommandLineOptions vm_options(argc + EXTRA_VM_ARGUMENTS);
   CommandLineOptions dart_options(argc);
   bool print_flags_seen = false;
@@ skipping 135 matching lines @@
   exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }