async_sequence_number_  296 content/browser/histogram_synchronizer.cc     async_sequence_number_ = kNeverUsableSequenceNumber;
async_sequence_number_  308 content/browser/histogram_synchronizer.cc     if (sequence_number != async_sequence_number_)
async_sequence_number_  339 content/browser/histogram_synchronizer.cc     async_sequence_number_ = last_used_sequence_number_;
async_sequence_number_  147 content/browser/histogram_synchronizer.h   int async_sequence_number_;