Prevent test-log.cc from creating log files.

test/cctest/test-log.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 73 matching lines @@
     fflush(temp_file_);
     rewind(temp_file_);
     return temp_file_;
   }
 
  private:
   static bool init_flags_() {
     i::FLAG_log = true;
     i::FLAG_prof = true;
     i::FLAG_logfile = i::Log::kLogToTemporaryFile;
+    i::FLAG_logfile_per_isolate = false;
     return false;
   }
 
   const bool saved_log_;
   const bool saved_prof_;
   FILE* temp_file_;
   const bool trick_to_run_init_flags_;
   v8::HandleScope scope_;
   v8::Handle<v8::Context> env_;
   Logger* logger_;
@@ skipping 370 matching lines @@
     v8::Local<v8::String> s = result->ToString();
     i::ScopedVector<char> data(s->Utf8Length() + 1);
     CHECK_NE(NULL, data.start());
     s->WriteUtf8(data.start());
     printf("%s\n", data.start());
     // Make sure that our output is written prior crash due to CHECK failure.
     fflush(stdout);
     CHECK(false);
   }
 }