Fixes some memory leaks in //runtime/bin

runtime/bin/platform.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 "bin/platform.h"
 
 #include "include/dart_api.h"
 
 #include "bin/file.h"
 #include "bin/utils.h"
@@ skipping 84 matching lines @@
   intptr_t count = 0;
   char** env = Platform::Environment(&count);
   if (env == NULL) {
     OSError error(-1,
                   "Failed to retrieve environment variables.",
                   OSError::kUnknown);
     Dart_SetReturnValue(args, DartUtils::NewDartOSError(&error));
   } else {
     Dart_Handle result = Dart_NewList(count);
     if (Dart_IsError(result)) {
-      Platform::FreeEnvironment(env, count);
       Dart_PropagateError(result);
     }
     for (intptr_t i = 0; i < count; i++) {
       Dart_Handle str = DartUtils::NewString(env[i]);
       if (Dart_IsError(str)) {
-        Platform::FreeEnvironment(env, count);
         Dart_PropagateError(str);
       }
       Dart_Handle error = Dart_ListSetAt(result, i, str);
       if (Dart_IsError(error)) {
-        Platform::FreeEnvironment(env, count);
         Dart_PropagateError(error);
       }
     }
-    Platform::FreeEnvironment(env, count);
     Dart_SetReturnValue(args, result);
   }
 }
 
 
 void FUNCTION_NAME(Platform_GetVersion)(Dart_NativeArguments args) {
   Dart_SetReturnValue(args, Dart_NewStringFromCString(Dart_VersionString()));
 }
 
 }  // namespace bin
 }  // namespace dart