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We generalize CustomizeBrowserOptions() to be able to customize all options.
New function will be call CustomizeOptions(). We do it in 3 steps:
1) Add CustomizeOptions() method to Benchmark.
2) Overload it in PerfBenchmark, instead of CustomizeBrowserOptions().
3) Remove CustomizeBrowserOptions() method from Benchmark.

This is step 2.

Bug: 801528
Change-Id: Ia1db40a04d5fddf1c634074bbd8f92ba4ccfc6f7
Reviewed-on: https://chromium-review.googlesource.com/c/1479965
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635599}