Binary search tool: Refactor bs to binary_search

TEST=Run unit tests

Change-Id: Ia7f682c42602e9355d1e2db67e258e2864c78126
Reviewed-on: https://chrome-internal-review.googlesource.com/265276
Commit-Ready: Cassidy Burden <cburden@google.com>
Tested-by: Cassidy Burden <cburden@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
Reviewed-by: Han Shen <shenhan@google.com>
1 file changed