- Make sure that externals are patched for dart2js.

runtime/bin/platform.h

 // 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.
 
 #ifndef BIN_PLATFORM_H_
 #define BIN_PLATFORM_H_
 
 #include "bin/builtin.h"
 
 
@@ skipping 38 matching lines @@
     return executable_name_;
   }
   static const char* GetResolvedExecutableName() {
     if (resolved_executable_name_ == NULL) {
       // Try to resolve the executable path using platform specific APIs.
       resolved_executable_name_ = Platform::ResolveExecutablePath();
     }
     return resolved_executable_name_;
   }
 
-  // Stores and gets the package root.
-  static void SetPackageRoot(const char* package_root) {
-    package_root_ = package_root;
-  }
-  static const char* GetPackageRoot() {
-    return package_root_;
-  }
-
   // Stores and gets the flags passed to the executable.
   static void SetExecutableArguments(int script_index, char** argv) {
     script_index_ = script_index;
     argv_ = argv;
   }
   static int GetScriptIndex() {
     return script_index_;
   }
   static char** GetArgv() {
     return argv_;
   }
 
   static DART_NORETURN void Exit(int exit_code);
 
  private:
   // The path to the executable.
   static const char* executable_name_;
   // The path to the resolved executable.
   static const char* resolved_executable_name_;
 
-  static const char* package_root_;
   static int script_index_;
   static char** argv_;  // VM flags are argv_[1 ... script_index_ - 1]
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Platform);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_PLATFORM_H_